The average height of a group of 4 boys is 144 cm. When Dylan, Gabriel and Andy joined the group, the average height increased by 6 cm. What is Dylan, Gabriel and Andy's total height?
| |
4 boys |
7 boys |
| Number |
4 |
7 |
| Value |
144 |
150 |
| Total value |
576 |
1050 |
Total number of boys after 3 more boys joined the group
= 4 + 3
= 7
New average height after 3 more boys joined the group
= 144 + 6
= 150 cm
Total height of 4 boys
= 4 x 144
= 576 cm
Total height of 7 boys
= 7 x 150
= 1050 cm
Total height of Dylan, Gabriel and Andy
= 1050 - 576
= 474 cm
Answer(s): 474 cm
