it seems like you have the answer already. but heres how its calculated.
\(\frac{100}{15} = \frac{?}{3}\)
so the missing number is 20 cross multiply 100 and 3 to get 300 then divide 15 into 300 to get 20
\(\frac{160}{100} = \frac{80}{?}\)
so the missing number is 50
cross multiply 100 and 80 to get 8000 then divide 160 into 8000 to get 50
