The average height of a group of 7 boys is 118 cm. When Pierre, Luke and Cole joined the group, the average height increased by 12 cm. What is Pierre, Luke and Cole's total height?
| |
7 boys |
10 boys |
| Number |
7 |
10 |
| Value |
118 |
130 |
| Total value |
826 |
1300 |
Total number of boys after 3 more boys joined the group
= 7 + 3
= 10
New average height after 3 more boys joined the group
= 118 + 12
= 130 cm
Total height of 7 boys
= 7 x 118
= 826 cm
Total height of 10 boys
= 10 x 130
= 1300 cm
Total height of Pierre, Luke and Cole
= 1300 - 826
= 474 cm
Answer(s): 474 cm
