Question

X+13%x-28%x=3.4 120-25%x=100 怎莫算

Answer 1

（1）

X + 13%X - 28%X = 3.4

（100%+13%-28%）X = 3.4

85%X = 3.4

X = 3.4 ÷ 85% = 4

（2）

120 - 25%X = 100

120 - 100 = 25%X

20 = 25%X

X = 20 ÷ 25% = 80