The answer:
33
Explanation:
Step 1: Call: A-shirt, B-cap, C-Short
2A+B=13(1)
3C=75(2)
2B+C=31(3)
Step 2:
3C=75 ⟹ C=25
Step 3:
Insert C=25 into 2B+C=31:
2B+25=31⟹2B=31−25=6 ⟹B= 3
Step 4:
Insert B=3 into 2A+B=13:
2A+3=13⟹2A=13−3=10 ⟹A=5
Step 5:
A + B + C = 5 + 3 + 25 = 33
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