PQS = 40 because if you look at the image above it half equals 20 and 20+20=40
Since it's 50mL of hardener added in ONE container of resin, you multiply 50 and 15
50mL times 15= 750mL
Hope this helps.
Think about you have a pizza. you have 6 people and a total of 12 slices. How many can each person get? 2.
This is the same thing. $2.47 divided by 6 people = $0.46 cents each
10 + f = 10
-10 -10
f = 10 - 10
f = 0.