Me ! (i am terrible at math)

a public opinion survey is administered to determine how different age groups feel about an increase in the minimum wage. some of the results are shown in the table below.

for - against - no opinion
(21-40 yrs old) 0 20 5
(41-60 yrs old) 20 0 20
(over 60 yrs old) 55 15 5

the survey showed that 40% of the 21 - 40 year-olds surveyed are against an increase, and 15% of the entire sample surveyed has no opinion.

how many 21 - 40 year-olds surveyed are for an increase?

how many 41 - 60 year-olds are against an increase?