The average height of a group of 5 boys is 138 cm. When Seth, Zeph and Andy joined the group, the average height increased by 11 cm. What is Seth, Zeph and Andy's total height?
| |
5 boys |
8 boys |
| Number |
5 |
8 |
| Value |
138 |
149 |
| Total value |
690 |
1192 |
Total number of boys after 3 more boys joined the group
= 5 + 3
= 8
New average height after 3 more boys joined the group
= 138 + 11
= 149 cm
Total height of 5 boys
= 5 x 138
= 690 cm
Total height of 8 boys
= 8 x 149
= 1192 cm
Total height of Seth, Zeph and Andy
= 1192 - 690
= 502 cm
Answer(s): 502 cm
