The average height of a group of 8 boys is 143 cm. When Pierre, Albert and Elijah left the group, the average height decreased by 10 cm. What is Pierre, Albert and Elijah's total height?
| |
8 boys |
5 boys |
| Number |
8 |
5 |
| Value |
143 |
133 |
| Total value |
1144 |
665 |
Total number of boys after 3 boys left the group
= 8 - 3
= 5
New average height after 3 boys left the group
= 143 - 10
= 133 cm
Total height of 8 boys
= 8 x 143
= 1144 cm
Total height of 5 boys
= 5 x 133
= 665 cm
Total height of Pierre, Albert and Elijah
= 1144 - 665
= 479 cm
Answer(s): 479 cm
