The average height of a group of 4 boys is 121 cm. When Valen, Peter and Pierre joined the group, the average height increased by 8 cm. What is Valen, Peter and Pierre's total height?
| |
4 boys |
7 boys |
| Number |
4 |
7 |
| Value |
121 |
129 |
| Total value |
484 |
903 |
Total number of boys after 3 more boys joined the group
= 4 + 3
= 7
New average height after 3 more boys joined the group
= 121 + 8
= 129 cm
Total height of 4 boys
= 4 x 121
= 484 cm
Total height of 7 boys
= 7 x 129
= 903 cm
Total height of Valen, Peter and Pierre
= 903 - 484
= 419 cm
Answer(s): 419 cm
