Kylie is 10% heavier than Billy. Joelle is 20% lighter than Billy. Kylie is 30 kg heavier than Joelle. What is Billy's mass?
| Kylie |
Billy |
Joelle |
| 110% |
100% |
|
| |
100% |
80% |
| 11 u |
10 u |
8 u |
Kylie's mass compared to Billy's mass in percent
= 100% + 10%
= 110%
Joelle's mass compared to Billy's mass in percent
= 100% - 20%
= 80%
110% =
110100 =
111080% =
80100 =
810Billy's mass is the repeated identity. Make Billy's mass the same.
Billy's mass = 10 u
Mass that Kylie has more than Joelle
= 11 u - 8 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Billy's mass
= 10 u
= 10 x 10
= 100 kg
Answer(s): 100 kg
