Answer to Q138
Let small cup = S
Let big cup = B
Let handle-less paper coffee cup = H
S + B = 5
S + H = 7
B + H = 8
S + B + H = ?
It, can be written as:
S + B + 0 = 5
S + 0 + H = 7
0+ B + H = 8
Adding all together gives:
2S + 2B + 2H = 20
Divide all through by 2
s + B + H = 10
Answer: 10
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