Question

If xy is a 2 digit no. And x+y = 7 , it becomes yx if 27.Is added. What is cy?

Answer 1

Answer:

x+y=7

10x+y+27=10y+x ---------> -9x+9y = 27

9x+9y=63

-9x+9y=27

Adding these equations we get

y=5

therefore x=2

therefore number is 25