Mary is 10% heavier than Glen. Linda is 30% lighter than Glen. Mary is 8 kg heavier than Linda. What is Glen's mass?
| Mary |
Glen |
Linda |
| 110% |
100% |
|
| |
100% |
70% |
| 11 u |
10 u |
7 u |
Mary's mass compared to Glen's mass in percent
= 100% + 10%
= 110%
Linda's mass compared to Glen's mass in percent
= 100% - 30%
= 70%
110% =
110100 =
111070% =
70100 =
710Glen's mass is the repeated identity. Make Glen's mass the same.
Glen's mass = 10 u
Mass that Mary has more than Linda
= 11 u - 7 u
= 4 u
4 u = 8
1 u = 8 ÷ 4 = 2
Glen's mass
= 10 u
= 10 x 2
= 20 kg
Answer(s): 20 kg
