The sum of three numbers is 798. One of the numbers,x, is 80% more than the sum of the other two numbers. What is the value of x?

Question

A)570

B)513

C)214

D)155

Answer 1

s represents the sum of the other two

x = 1.8s

x + s = 798

 

Solve by substitution

Answer 2

x+y+z=798 or y+z=798-x

 

x=1.8(y+z)

substituting for y+z in the 2nd equation 

 

x=1.8(798-x)

x=1436.4-1.8x

2.8x=1436.4

x=513. The answer is b.