The average height of a group of 7 boys is 149 cm. When John, Ben and Daniel left the group, the average height decreased by 2 cm. What is John, Ben and Daniel's total height?
| |
7 boys |
4 boys |
| Number |
7 |
4 |
| Value |
149 |
147 |
| Total value |
1043 |
588 |
Total number of boys after 3 boys left the group
= 7 - 3
= 4
New average height after 3 boys left the group
= 149 - 2
= 147 cm
Total height of 7 boys
= 7 x 149
= 1043 cm
Total height of 4 boys
= 4 x 147
= 588 cm
Total height of John, Ben and Daniel
= 1043 - 588
= 455 cm
Answer(s): 455 cm
