Question

Seven times a two digit number equal four times the number with digit reversed find the number if the sum of its digit is 3​

Answer 1

Answer:

let the ones digit is x, and tenth digit is y. then the number will be 10x+y.

If we reverse their positions then the number will be 10y+x.

We know 7(10x+y)=4(10y+x)

=>70x+7y = 40y+x

=> 66x=33y

=> 2x=y

but x+y=3

x+2x=3

x=1 & y=2

the numbers are 12 and 21