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There are 35 mobile phones in a box, out of which the average weight of 12 mobile phones is 50 grams and the average weight of 11 mobile phones is 40 grams and the average weight of the remaining mobile phones is 45 grams, then find the average weight of all mobile phones. (approx.)
  • a)
    45 grams
  • b)
    48 grams
  • c)
    43 grams
  • d)
    40 grams
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
There are 35 mobile phones in a box, out of which the average weight ...
Given:
Total mobile phones in the box are 35.
The average weight of 12 mobile phones is 50 grams.
The average weight of 11 mobile phones is 40 grams.
The average weight of the remaining mobile phones is 45 grams.
Concept:Often "average" refers to the arithmetic mean, the sum of the numbers divided by how many numbers are being averaged.
Formula used:
Total weight = Average weight × total number of items
Average = Total sum of all numbers / Total numbers of items
Calculation:Total mobile phones in the box are 35.
The average weight of 12 mobile phones = 50 grams.
Then, the total weight of 12 mobile phones
⇒ 12 × 50 = 600 grams
The average weight of the next 11 mobile phones is 40 grams.
Then, the total weight of 11 mobile phones
⇒ 11 × 40 = 440 grams
Remaining number of mobile phones
⇒ 35 – 12 – 11 = 12
The average weight of the remaining mobile phones is 45 grams.
Then, the total weight of the remaining mobile phones
⇒ 12 × 45 = 540 gram
Now the total weight of 35 mobile phones
⇒ 600 + 440 + 540 = 1580 grams
Now to find the average weight of 35 mobile phones
Average = Total weight / Total numbers of an item
⇒ 1580 / 35 = 45.12 grams
∴ the average weight of all mobile phones is 45 grams.
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Direction: Read the following passage carefully and answer the questions. Your answer to these questions should be based on passage only.As concern about radiation from phones and base stations continues to grow, health experts advice a change of habits-spending less time on the phone, using landline, and texting rather than calling-to cut the risk. The risk of brain cancer as a result of excessive use of phones cannot be ruled out. Reduced use of mobile phones is advised, Cancer is an extreme example. We get many cases of parents complaining that their children lack concentration, get headache and have behavioral problems. This cannot be proved, though. A scientist with ICMR said exposure to radio frequency radiation has a thermal effects, caused by holding a phone close to the body, and also a non-thermal effect which can be attributed to the induced electromagnetic effects inside biological cells. The non-thermal effect is possibly more harmful. People who are chronically exposed to low level wireless antenna emissions and users of mobile phone handsets have reported feeling several unspecific symptoms.Q. How can the chances of brain cancer be reduced?

Direction: Read the following passage carefully and answer the questions. Your answer to these questions should be based on passage only.If you are worried by the radiation emitted by cell phone towers around you, there is some good news. From September 1, this year, India will lower the level to one tenth of the prevailing standard from 9.2 w/m2 to 0.92 w/m2. The decision follows a report of the inter-ministerial committee formed by the Ministry of communications and Information Technology to study the hazards posed by e.m.f radiation from base stations and mobile phones. Sharma said lowering of the limit is a preventive step against serious health risks posed by radiation emitted from towers which includes the possibility of developing certain types of cancer. The cause and effect relationship though hasnt been established yet. The department of telecommunications has also issued directions for reducing the specific absorption rate, a measure of the amount of radio frequency energy absorbed by the body while using a phoneQ.What was the outcome of the committee?

Direction: Read the following passage carefully and answer the questions. Your answer to these questions should be based on passage only.If you are worried by the radiation emitted by cell phone towers around you, there is some good news. From September 1, this year, India will lower the level to one tenth of the prevailing standard from 9.2 w/m2 to 0.92 w/m2. The decision follows a report of the inter-ministerial committee formed by the Ministry of communications and Information Technology to study the hazards posed by e.m.f radiation from base stations and mobile phones. Sharma said lowering of the limit is a preventive step against serious health risks posed by radiation emitted from towers which includes the possibility of developing certain types of cancer. The cause and effect relationship though hasnt been established yet. The department of telecommunications has also issued directions for reducing the specific absorption rate, a measure of the amount of radio frequency energy absorbed by the body while using a phoneQ.Why was the inter-ministerial committee formed by the Ministry of Communications and Information Technology?

Direction: Read the following passage carefully and answer the questions. Your answer to these questions should be based on passage only.As concern about radiation from phones and base stations continues to grow, health experts advice a change of habits-spending less time on the phone, using landline, and texting rather than calling-to cut the risk. The risk of brain cancer as a result of excessive use of phones cannot be ruled out. Reduced use of mobile phones is advised, Cancer is an extreme example. We get many cases of parents complaining that their children lack concentration, get headache and have behavioral problems. This cannot be proved, though. A scientist with ICMR said exposure to radio frequency radiation has a thermal effects, caused by holding a phone close to the body, and also a non-thermal effect which can be attributed to the induced electromagnetic effects inside biological cells. The non-thermal effect is possibly more harmful. People who are chronically exposed to low level wireless antenna emissions and users of mobile phone handsets have reported feeling several unspecific symptoms.Q.What are the complaints made by the parents?

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There are 35 mobile phones in a box, out of which the average weight of 12 mobile phones is 50 grams and the average weight of 11 mobile phones is 40 grams and the average weight of the remaining mobile phones is 45 grams, then find the average weight of all mobile phones. (approx.)a)45 gramsb)48 gramsc)43 gramsd)40 gramsCorrect answer is option 'A'. Can you explain this answer?
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