Question

aflați X : [( X÷3+8):4+7]×5-10=40

Answer 1

[(x:3 + 8):4 +7] x 5 - 10 = 40

[(x:3 + 8):4 + 7] x 5 = 40+10

[(x:3 + 8):4 + 7] x 5 = 50

(x:3 + 8):4 + 7 = 50:5

(x:3 + 8):4 + 7 = 10

(x:3 + 8):4 = 10-7

(x:3 + 8):4 = 3

x:3 + 8 = 3x4

x:3 + 8 = 12

x:3 = 12-8

x:3 = 4

x = 4x3

x = 12

Answer 2

40+10=5×[7+4÷(8+3:x)]

50÷5=7+4÷(8+3÷x)

10-7=4÷(8+3÷x)

3×4=8+3÷x

12-8=3÷x

X÷3=4

X=3×4

X=12