The average height of a group of 6 boys is 140 cm. When Sam, Warren and Neave joined the group, the average height increased by 11 cm. What is Sam, Warren and Neave's total height?
| |
6 boys |
9 boys |
| Number |
6 |
9 |
| Value |
140 |
151 |
| Total value |
840 |
1359 |
Total number of boys after 3 more boys joined the group
= 6 + 3
= 9
New average height after 3 more boys joined the group
= 140 + 11
= 151 cm
Total height of 6 boys
= 6 x 140
= 840 cm
Total height of 9 boys
= 9 x 151
= 1359 cm
Total height of Sam, Warren and Neave
= 1359 - 840
= 519 cm
Answer(s): 519 cm
