Question

15×a+5=50 (38-a):2=17 (56+a):3=20 (90:c):3=10
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Answer 1

15•a+5=50
15•a=50-5
15•a=45
a=45/15=> a=3

38-a=17•2
38-a=34
a=38-34
a=4

56+a=20•3
56+a=60
a=60-56
a=4

90:c=10•3
90:c=30
c=90:30
c=3