Question

If 5x+2y=20 and y=10, what is 3x?​

Answer 1

3x = 0

Explanation:

Given,

y = 10

now,

5x+2y = 20

or, 5x+2×10=20

or, 5x = 20-20

or, 5x = 0

or, x = 0/5

or, x = 0

Again,

3x = 3×0 =0