Question

Divide 16 into two parts,such that one part is 3 times other

Answer 1

let the no. be x
x+3x=16
4x=16
x=4
so 1 no. will be 4 and other 12.
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Answer 2

Let x and y be the two required parts

As per the question, x+y=16 ..............(1)
And. X=3y

Substituting x=3y in (1)
Therefore, 3y+y=16
4y=16
y=4

Therefore x=12 and y=4 is the required solution