Jean is 25% heavier than David. Min is 30% lighter than David. Jean is 55 kg heavier than Min. What is David's mass?
| Jean |
David |
Min |
| 125% |
100% |
|
| |
100% |
70% |
| 25 u |
20 u |
14 u |
Jean's mass compared to David's mass in percent
= 100% + 25%
= 125%
Min's mass compared to David's mass in percent
= 100% - 30%
= 70%
125% =
125100 =
252070% =
70100 =
1420David's mass is the repeated identity. Make David's mass the same.
David's mass = 20 u
Mass that Jean has more than Min
= 25 u - 14 u
= 11 u
11 u = 55
1 u = 55 ÷ 11 = 5
David's mass
= 20 u
= 20 x 5
= 100 kg
Answer(s): 100 kg
