Question

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The ten's digit of A two digit number is three times the unit digit.
The sum of the number and the unit digit is 32.
Find the number....



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Answer 1

Let the two numbers be x and y.

If x is the number in the 10th digit and y is the unit digit, then

x = 3y

and 10x+y+y = 32

10x + 2y = 32

and x = 3y.

Substituting the value of x in

10x+2y = 32,

we get

10 * 3y +2y = 32

or 32y = 32 or y = 1

and x = 3.

Thus, the number is 31.

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Answer 2

SOLUTION

Let the two numbers be x & y.

If x is the number in the 10th digit &y is the unit digit, then

x= 3y

=) 10x + y+y = 32

=) 10x+ 2y= 32

Substitute the value of x in 10x+2y= 32

=) 10× 3y + 2y= 32

=) 32y= 32

=) y= 32/32

=) y= 1

& x= 3

Thus the number is 31.

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