The average height of a group of 5 boys is 100 cm. When Owen, Bobby and Xavier joined the group, the average height increased by 11 cm. What is Owen, Bobby and Xavier's total height?
| |
5 boys |
8 boys |
| Number |
5 |
8 |
| Value |
100 |
111 |
| Total value |
500 |
888 |
Total number of boys after 3 more boys joined the group
= 5 + 3
= 8
New average height after 3 more boys joined the group
= 100 + 11
= 111 cm
Total height of 5 boys
= 5 x 100
= 500 cm
Total height of 8 boys
= 8 x 111
= 888 cm
Total height of Owen, Bobby and Xavier
= 888 - 500
= 388 cm
Answer(s): 388 cm
