The average height of a group of 7 boys is 144 cm. When Michael, Zeph and Neave left the group, the average height decreased by 9 cm. What is Michael, Zeph and Neave's total height?
| |
7 boys |
4 boys |
| Number |
7 |
4 |
| Value |
144 |
135 |
| Total value |
1008 |
540 |
Total number of boys after 3 boys left the group
= 7 - 3
= 4
New average height after 3 boys left the group
= 144 - 9
= 135 cm
Total height of 7 boys
= 7 x 144
= 1008 cm
Total height of 4 boys
= 4 x 135
= 540 cm
Total height of Michael, Zeph and Neave
= 1008 - 540
= 468 cm
Answer(s): 468 cm
