Question

Plz Explain Step By Step

Four times a certain 2
Two digit number is 7 times the number obtained on interchanging its digits if the difference between the digits is 4 .find the number

Answer 1

Answer:

These are 4 and 8.

let the no.'s be x and y...

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

40x+4y = 70y + 7x

33x = 66y

x= 2y..............(1)

according to qn x-y=4 (let x grtr than y)

x= 4+y... put in (1)

4+y = 2y

y= 4..

so, x= 4+4 = 8..