The average height of a group of 5 boys is 147 cm. When Bobby, Ken and Carl left the group, the average height decreased by 10 cm. What is Bobby, Ken and Carl's total height?
| |
5 boys |
2 boys |
| Number |
5 |
2 |
| Value |
147 |
137 |
| Total value |
735 |
274 |
Total number of boys after 3 boys left the group
= 5 - 3
= 2
New average height after 3 boys left the group
= 147 - 10
= 137 cm
Total height of 5 boys
= 5 x 147
= 735 cm
Total height of 2 boys
= 2 x 137
= 274 cm
Total height of Bobby, Ken and Carl
= 735 - 274
= 461 cm
Answer(s): 461 cm
