Step-by-step explanation:
15+10 = 3+2+20
25= 25
35+20= 18+17+20
55= 55
45+15= 18+a+20
60= 38+a
22= a
70+18= 40+b+20
88= 60+b
28= b
#666
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Step-by-step explanation:
15+10 = 3+2+20
25= 25
35+20= 18+17+20
55= 55
45+15= 18+a+20
60= 38+a
22= a
70+18= 40+b+20
88= 60+b
28= b
#666