The average height of a group of 9 boys is 131 cm. When Luis, Ken and Mark left the group, the average height decreased by 12 cm. What is Luis, Ken and Mark's total height?
| |
9 boys |
6 boys |
| Number |
9 |
6 |
| Value |
131 |
119 |
| Total value |
1179 |
714 |
Total number of boys after 3 boys left the group
= 9 - 3
= 6
New average height after 3 boys left the group
= 131 - 12
= 119 cm
Total height of 9 boys
= 9 x 131
= 1179 cm
Total height of 6 boys
= 6 x 119
= 714 cm
Total height of Luis, Ken and Mark
= 1179 - 714
= 465 cm
Answer(s): 465 cm
