x * 40 = 640 + 560
x * 40 = 1200
x = 1200 : 40
x = 30
240 : x = 64 : 16
240 : x = 4
x = 240 : 4
x = 60
y : 60 = 95 – 25
y : 60 = 70
y = 70 * 60
y = 4200
x : 5 = 1400 – 900
x : 5 = 500
x = 500 * 5
x = 2500
Ответ: 1) x = 30; 2) x = 60; 3) y = 4200; 4) x = 2500