The average height of a group of 10 boys is 115 cm. When Carl, Owen and Oscar left the group, the average height decreased by 8 cm. What is Carl, Owen and Oscar's total height?
| |
10 boys |
7 boys |
| Number |
10 |
7 |
| Value |
115 |
107 |
| Total value |
1150 |
749 |
Total number of boys after 3 boys left the group
= 10 - 3
= 7
New average height after 3 boys left the group
= 115 - 8
= 107 cm
Total height of 10 boys
= 10 x 115
= 1150 cm
Total height of 7 boys
= 7 x 107
= 749 cm
Total height of Carl, Owen and Oscar
= 1150 - 749
= 401 cm
Answer(s): 401 cm
