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(bx4+20):2=54 sa aflam necunoscutul

Răspuns :

(bx4+20):2=54
bx4+20=54x2=108
bx4=108-20=88
b=88:4
b=22
(b × 4 + 20) : 2 = 54

b × 4 + 20 = 54 × 2

b × 4 + 20 = 108

b × 4 = 108 - 20

b × 4 = 88

b = 88 : 4

b = 22