The average height of a group of 6 boys is 116 cm. When Justin, Cole and Perry left the group, the average height decreased by 10 cm. What is Justin, Cole and Perry's total height?
| |
6 boys |
3 boys |
| Number |
6 |
3 |
| Value |
116 |
106 |
| Total value |
696 |
318 |
Total number of boys after 3 boys left the group
= 6 - 3
= 3
New average height after 3 boys left the group
= 116 - 10
= 106 cm
Total height of 6 boys
= 6 x 116
= 696 cm
Total height of 3 boys
= 3 x 106
= 318 cm
Total height of Justin, Cole and Perry
= 696 - 318
= 378 cm
Answer(s): 378 cm
