Question

Aflați numerele necunoscute:

a+75+75:5=115

300-b × 8 - 109= 47

(48 × c + 216) :40= 27

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Answer 1

a+75+75:5=115

a+75+15=115

a+75=115-15

a+75=100

a=100-75

a=25
_____________

300-b×8-109=47

300-b×8=47+109

300-b×8=156

b×8=300-156

b×8=144

b=144:8

b=18
_______________

(48×c+216):40=27

(48×c+216)=27×40

(48×c+216)=1080

48×c=1080-216

48×c=864

c=864:48

c=18