Question

There are 90 students in a speech contest. Yesterday, 2/5

of them gave their speeches. Today 1/3 of the remaining students gave their speeches. How many students still haven't given their speeches?

Answer 1

$Answer: \\ 90 - \frac{2}{5} \times 90 - \frac{1}{3} \times \frac{2}{5} \times 90 = 36 \\ \Rightarrow 36 \: students \: haven't \: given \: their \: speeches$