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Question

Two balls weigh 15kg. If one is 4 times heavier than the other, what is the mass of the heavier ball?

A
15kg
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B
12kg
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C
9kg
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D
4kg
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Solution

The correct option is C 12kg
Let the one ball weight is x Kg
Given that the second ball is 4 times heavier than first ball
Then weight of second ball =4×x=4x
And also given that two balls weight is 15 Kg
x+4x=15
5x=15
x=3 Kg
Then weight of heavier ball =4x=4×3=12 Kg

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