Question

3x=30
2x+y=40
x+2y+2h=60
h= ?

Answer 1

30/3 = 10 ............. x = 10

2x = 20 + y = 40
40 - 20 = 20 ....... y = 20

x+2y+2h = 60
10 + 40 + 2h = 60
60 - 50 = 10
10/2 = 5

H = 5