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b:9:7=4
c×4×8=64
(d+50)×4=240
(e-300)×6=120

Răspuns :

b:9:7=4
b:9=4x7
b=28x9
b=252
cx4x8=64
cx4=64:8
c=8:4
c=2
(d+50)x4=240
d+50=240:4
d=60-50
d=10
(e-300)x6=120
e-300=120:6
e=300+20
e=320

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