The average height of a group of 7 boys is 113 cm. When Seth, Jeremy and Dylan joined the group, the average height increased by 6 cm. What is Seth, Jeremy and Dylan's total height?
| |
7 boys |
10 boys |
| Number |
7 |
10 |
| Value |
113 |
119 |
| Total value |
791 |
1190 |
Total number of boys after 3 more boys joined the group
= 7 + 3
= 10
New average height after 3 more boys joined the group
= 113 + 6
= 119 cm
Total height of 7 boys
= 7 x 113
= 791 cm
Total height of 10 boys
= 10 x 119
= 1190 cm
Total height of Seth, Jeremy and Dylan
= 1190 - 791
= 399 cm
Answer(s): 399 cm
