The average height of a group of 8 boys is 107 cm. When Riordan, Will and Zane left the group, the average height decreased by 9 cm. What is Riordan, Will and Zane's total height?
| |
8 boys |
5 boys |
| Number |
8 |
5 |
| Value |
107 |
98 |
| Total value |
856 |
490 |
Total number of boys after 3 boys left the group
= 8 - 3
= 5
New average height after 3 boys left the group
= 107 - 9
= 98 cm
Total height of 8 boys
= 8 x 107
= 856 cm
Total height of 5 boys
= 5 x 98
= 490 cm
Total height of Riordan, Will and Zane
= 856 - 490
= 366 cm
Answer(s): 366 cm
