The average height of a group of 7 boys is 141 cm. When Dylan, Cody and Daniel left the group, the average height decreased by 2 cm. What is Dylan, Cody and Daniel's total height?
|
7 boys |
4 boys |
Number |
7 |
4 |
Value |
141 |
139 |
Total value |
987 |
556 |
Total number of boys after 3 boys left the group
= 7 - 3
= 4
New average height after 3 boys left the group
= 141 - 2
= 139 cm
Total height of 7 boys
= 7 x 141
= 987 cm
Total height of 4 boys
= 4 x 139
= 556 cm
Total height of Dylan, Cody and Daniel
= 987 - 556
= 431 cm
Answer(s): 431 cm