A chemical reaction requires 3 parts A to 5 parts B. If you have 30 units of A, how much B do you need?
Answer
50 units
How to solve it
1
Ratio A:B = 3:5
2
A available: 30
3
Scale factor: 30 ÷ 3 = 10
4
B needed: 5 × 10 = 50
Hints
Find scale factor
Multiply ratio by scale factor