The average height of a group of 6 boys is 135 cm. When Oliver, Oscar and Howard left the group, the average height decreased by 2 cm. What is Oliver, Oscar and Howard's total height?
| |
6 boys |
3 boys |
| Number |
6 |
3 |
| Value |
135 |
133 |
| Total value |
810 |
399 |
Total number of boys after 3 boys left the group
= 6 - 3
= 3
New average height after 3 boys left the group
= 135 - 2
= 133 cm
Total height of 6 boys
= 6 x 135
= 810 cm
Total height of 3 boys
= 3 x 133
= 399 cm
Total height of Oliver, Oscar and Howard
= 810 - 399
= 411 cm
Answer(s): 411 cm
