The average height of a group of 10 boys is 115 cm. When Jack, Perry and Cole left the group, the average height decreased by 3 cm. What is Jack, Perry and Cole's total height?
| |
10 boys |
7 boys |
| Number |
10 |
7 |
| Value |
115 |
112 |
| Total value |
1150 |
784 |
Total number of boys after 3 boys left the group
= 10 - 3
= 7
New average height after 3 boys left the group
= 115 - 3
= 112 cm
Total height of 10 boys
= 10 x 115
= 1150 cm
Total height of 7 boys
= 7 x 112
= 784 cm
Total height of Jack, Perry and Cole
= 1150 - 784
= 366 cm
Answer(s): 366 cm
