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Question

Two natural numbers are in the ratio 3:4. The sum of their squares is 625. Find the numbers.


A

20,10

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B

15,20

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C

5,10

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D

15,10

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Solution

The correct option is B

15,20


Let the numbers be 3x and 4x.

Then (3x)2+(4x)2=625

9x2+16x2=625

i.e., 25x2=625

x2=62525=25

Since x is a natural number, x = 5.

Therefore, the numbers are 3x=3×5=15 and 4x=4×5=20.


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