The average height of a group of 6 boys is 120 cm. When Vincent, Reggie and Sam joined the group, the average height increased by 3 cm. What is Vincent, Reggie and Sam's total height?
| |
6 boys |
9 boys |
| Number |
6 |
9 |
| Value |
120 |
123 |
| Total value |
720 |
1107 |
Total number of boys after 3 more boys joined the group
= 6 + 3
= 9
New average height after 3 more boys joined the group
= 120 + 3
= 123 cm
Total height of 6 boys
= 6 x 120
= 720 cm
Total height of 9 boys
= 9 x 123
= 1107 cm
Total height of Vincent, Reggie and Sam
= 1107 - 720
= 387 cm
Answer(s): 387 cm
