Question

The second of two Numbers is 4 times the first.their sum is 50 find the numbers

Answer 1

First no. = A, second no. = B, A + B = 50, 
B = 4*A, put this in above equation of sum.
A + 4*A = 50, 5*A = 50, A = 50/5 = 10, 
A = 10, B = 4*A = 4*10 = 40.

Answer 2

The first number is ten and the second is forty.