The average height of a group of 5 boys is 123 cm. When Seth, Flynn and Xavier joined the group, the average height increased by 9 cm. What is Seth, Flynn and Xavier's total height?
| |
5 boys |
8 boys |
| Number |
5 |
8 |
| Value |
123 |
132 |
| Total value |
615 |
1056 |
Total number of boys after 3 more boys joined the group
= 5 + 3
= 8
New average height after 3 more boys joined the group
= 123 + 9
= 132 cm
Total height of 5 boys
= 5 x 123
= 615 cm
Total height of 8 boys
= 8 x 132
= 1056 cm
Total height of Seth, Flynn and Xavier
= 1056 - 615
= 441 cm
Answer(s): 441 cm
