Question

X + X x 1/4 : 2/7 + x : 2/9 = 255

Answer 1

x + x × 1/4 : 2/7 + x : 2/9 = 255

x + x × 1/4 × 7/2 + x × 9/2 = 255

x + x × 7/8 + x × 9/2 = 255

x × (1 + 7/8 + 9/2) = 255

x × (8/8 + 7/8 + 36/8) = 255

x × 51/8 = 255

x = 255 : 51/8

x = 255 × 8/51

x = 40

Answer 2

x + x × 1/4 : 2/7 + x : 2/9 = 255

x + x × 1/4 × 7/2 + x × 9/2 = 255

x + x × 7/8 + x × 9/2 = 255

x × (1 + 7/8 + 9/2) = 255

x × (8/8 + 7/8 + 36/8) = 255

x × 51/8 = 255

x = 255 : 51/8

x = 255 × 8/51

x = 40

Vậy x = 40

Answer 3

40