The average height of a group of 5 boys is 144 cm. When Tommy, Glen and Luke joined the group, the average height increased by 4 cm. What is Tommy, Glen and Luke's total height?
|
5 boys |
8 boys |
Number |
5 |
8 |
Value |
144 |
148 |
Total value |
720 |
1184 |
Total number of boys after 3 more boys joined the group
= 5 + 3
= 8
New average height after 3 more boys joined the group
= 144 + 4
= 148 cm
Total height of 5 boys
= 5 x 144
= 720 cm
Total height of 8 boys
= 8 x 148
= 1184 cm
Total height of Tommy, Glen and Luke
= 1184 - 720
= 464 cm
Answer(s): 464 cm