The average height of a group of 6 boys is 138 cm. When Ethan, Harry and Glen joined the group, the average height increased by 11 cm. What is Ethan, Harry and Glen's total height?
| |
6 boys |
9 boys |
| Number |
6 |
9 |
| Value |
138 |
149 |
| Total value |
828 |
1341 |
Total number of boys after 3 more boys joined the group
= 6 + 3
= 9
New average height after 3 more boys joined the group
= 138 + 11
= 149 cm
Total height of 6 boys
= 6 x 138
= 828 cm
Total height of 9 boys
= 9 x 149
= 1341 cm
Total height of Ethan, Harry and Glen
= 1341 - 828
= 513 cm
Answer(s): 513 cm
