In a school, ratio of boy students and girl students is 5 : 2. If the number of boy students is 450 more than the girl students, how many students are there in the school ?
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If 40% of 3/4 of 4/5 of some number is 48, what would be the value of 1 per cent of that number ?
Square of the sum of two positive numbers is 9. What would be the value of the sum of the cubes of these numbers ?
Which of the following diseases is caused by virus ?
Chromatographic technique is used for the following purposes—
At simple interest, a principal becomes double in 16 years. How much will the principal become in 8 years ?
A trader allows 10% discount on marked price of an article and gets 20% profit. If the marked price of the article is Rs. 50, what is its cost price ?
Find the least number which when divided by 4, 12 and 16 leaves remainder 3 in each case, but it is perfectly divisible by 7.
At what rate of simple interest, will a sum of money become 4 times in 15 years ?
A train 130 metres, running at a speed of 45 km/hr, crosses a bridge in 30 seconds. What is the length of the bridge ?
Square of the sum of two positive numbers is 9. What would be the value of the sum of the cubes of these numbers ?
4/5 part of a canister is filled with oil. 6 bottles of oil is taken out of it, leaving the threefourth part of the canister filled with oil. How many bottles of oil can fill the entire canister ?
If x : y : : 5 : 2 then the value of 8x + 9y : 8x : 2y will be—
A fraction has the same ratio with 1/27, that 3/11 has with 5/9 . What is that fraction ?
12 is the H. C. F. of three numbers. If the ratio of these numbers is 1 : 2 : 3, then what are these numbers ?
There is a group of 8 men. If a new man replaces a man of this group of 65 kg, average weight of the group rises by 1·5 kg. What is the weight of this new men ?
Average of 11 observations is 60. 58 is the average of first 5 observations and 56 is the average of last five observations. What is the 6th observation ?
Average age of 25 students is 10 years. Average age rises by one year, if the age of the teacher is also included. What is the age of the teacher ?
Sum of three numbers is 98. Ratio of first and second numbers is 2 : 3 and that of second and third is 5 : 8. What is second number ?
How many are the numbers between 200 and 600 which are perfectly divisible by 4, 5 and 6 ?
Area of the largest triangle drawn in a semicircle of radius r will be—
What would be the value of log 9, if log 27 = 1·431 ?
Three cubes of iron of sides 6 cms., 8 cm and 10 cm are melted and then converted into a single big cube what would be the side of this new cube ?