Maths Class 5 Other

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

A machine takes the input, multiplies it by 3, adds 24 to it and then divides the result by 6. If the output obtained was 9, what number was input in the machine?

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A 8
B 10
C 11
D 12

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Answer: B. 10

To find the input number, you can work backward from the output by reversing each operation:
Start with the output: 9
Reverse the division: Multiply by 6 ( 9 x 6 = 54)
Reverse the addition: Subtract 24 ( 54-24 =30)
Reverse the multiplication: Divide by 3 ( 30 /3 = 10)
The input number was 10

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A machine takes the input, multiplies it by 3, adds 24 to it and then divides the result by 6. If the output obtained was 9, what number was input in the machine?

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