Yoko is 20% heavier than Ahmad. Betty is 10% lighter than Ahmad. Yoko is 30 kg heavier than Betty. What is Ahmad's mass?
| Yoko |
Ahmad |
Betty |
| 120% |
100% |
|
| |
100% |
90% |
| 12 u |
10 u |
9 u |
Yoko's mass compared to Ahmad's mass in percent
= 100% + 20%
= 120%
Betty's mass compared to Ahmad's mass in percent
= 100% - 10%
= 90%
120% =
120100 =
121090% =
90100 =
910Ahmad's mass is the repeated identity. Make Ahmad's mass the same.
Ahmad's mass = 10 u
Mass that Yoko has more than Betty
= 12 u - 9 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Ahmad's mass
= 10 u
= 10 x 10
= 100 kg
Answer(s): 100 kg
