The answers are here but I want to know how to get to the answer. Can someone else help me?

Answer:
1)42
2)400
3)$2000
Step-by-step explanation:
Q1)
Q2)
$ = 240 ÷ (3/5)
= 240 x (5/3)
= 400
Q3)
# = $800 ÷ (2/5)
= $800 × (5/2)
= $2000
(Correct me if i am wrong)