1 question

Define $f(n) = n+n-n\times n \div n$.

Then your expression becomes $f(14) + f(3)+f(13)+f(24)+15+15\times15\div 15$.

Simplifying f(n): $f(n) = n+n-n\times n\div n = 2n - n = n$.

Therefore, the answer of the expression is $14 + 3 + 13 + 24 + 15 + 15 \times 15 \div 15$, which is 84.

good job