2?5+3?7. This is my summer holiday homework question. Seems like it is wrong as in place of plus there should be multiply sign.

Solution 
Assuming your question as " 2π5+3π7 "
Here, taking π as common, we get, 
π2×5+3×7=π10+21=31π

OR "if there is × sign, then
2 × 5 + 3 × 7
According to BODMAS rule,
(2 × 5) + (3 × 7) = 10 + 21 = 31
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