The average height of a group of 7 boys is 130 cm. When Carl, Eric and Daniel left the group, the average height decreased by 2 cm. What is Carl, Eric and Daniel's total height?
|
7 boys |
4 boys |
Number |
7 |
4 |
Value |
130 |
128 |
Total value |
910 |
512 |
Total number of boys after 3 boys left the group
= 7 - 3
= 4
New average height after 3 boys left the group
= 130 - 2
= 128 cm
Total height of 7 boys
= 7 x 130
= 910 cm
Total height of 4 boys
= 4 x 128
= 512 cm
Total height of Carl, Eric and Daniel
= 910 - 512
= 398 cm
Answer(s): 398 cm