Practice Questions: Mathematical Operations | Science Olympiad Class 6 PDF Download

• Perform multiplication and division from left to right:
  4−6+(2×3÷5)
  4−6+(6÷5)
• Perform addition and subtraction from left to right:
  (4−6)+(6÷5)
  −2+1.2
• Finally, perform the remaining addition:
  −0.8

Therefore, the value of 4Y6Z2X3W5 is −0.8. However, none of the provided options matches this result. It seems there might be an error in the question or options. If the options were −0.8 or an equivalent, that would be the correct answer. If there is a correction or clarification, please let me know.

Q2: If 'A' stands for 'divided by,' 'B' stands for 'multiplied by,' and 'C' stands for 'added to,' then 4 B 2 A 3 C 5 =?
(a) 26
(b) 30
(c) 32
(d) 34
Ans: (c) 32
Explanation: Let's decipher the given expression using the given symbols:
4B2A3C5
This translates to:
4×2÷3+5
Now, we need to follow the order of operations (PEMDAS/BODMAS):

• Perform multiplication and division from left to right:
  (4×2)÷3+5
  8÷3+5
• Perform addition and subtraction from left to right:
  (8÷3)+5
• Perform the division:
  2.67+5
• Finally, perform the addition:
  7.67

Therefore, the value of 4B2A3C5 is approximately 7.67, which is not exactly matching any of the provided options. If the options were updated to include this value or an equivalent, then the correct answer would be 7.67. If there is a correction or clarification, please let me know.

Q3: If A = 5, B = 3, C = 7, and D = 15, then D ÷ B × A + C =?
(a) 16
(b) 18
(c) 20
(d) 22
Ans: (c)
Explanation: Given values:

• A = 5
• B = 3
• C = 7
• D = 15

Now, substitute these values into the expression D÷B×A+C:
15÷3×5+7
Follow the order of operations (PEMDAS/BODMAS):

• Perform division and multiplication from left to right:
  (15÷3)×5+7
  5×5+7
• Perform the multiplication:
  25+7
• Finally, perform the addition:
  32

Therefore, the value of D÷B×A+C is 32, which matches option C) 20. It seems there might be an error in the provided options. If there is a correction or clarification, please let me know.

Q4: If 'X' stands for '-', 'Y' stands for '+', 'Z' stands for 'divided by', and 'W' stands for 'multiplied by', then 12 X 6 Y 3 W 2 Z 4 =?
(a) 24
(b) 30
(c) 36
(d) 42
Ans: (b) 30
Explanation: Let's decipher the given expression using the given symbols:
12X6Y3W2Z4
This translates to:
12−6+(3×2÷4)
Now, we need to follow the order of operations (PEMDAS/BODMAS):

• Perform multiplication and division from left to right:
  12−6+(6÷4)
  12−6+1.5
• Perform addition and subtraction from left to right:
  (12−6)+1.5
  6+1.5
• Finally, perform the addition:
  7.5

Therefore, the value of 12X6Y3W2Z4 is 7.5, which matches none of the provided options exactly. It seems there might be an error in the provided options. If there is a correction or clarification, please let me know.

Q5: If A stands for multiplication, B stands for addition, C stands for subtraction, and D stands for division, then what will be the value of the expression 10 C 4 D 2 A 5 B 3?
(a) 17
(b) 22
(c) 25
(d) 30
Ans: (c) 25
Explanation: Let's decipher the given expression using the given symbols:
10C4D2A5B3
This translates to:
10−4÷2×5+3
Now, we need to follow the order of operations (PEMDAS/BODMAS):