The average height of a group of 6 boys is 143 cm. When Luke, Ken and Fred joined the group, the average height increased by 12 cm. What is Luke, Ken and Fred's total height?
| |
6 boys |
9 boys |
| Number |
6 |
9 |
| Value |
143 |
155 |
| Total value |
858 |
1395 |
Total number of boys after 3 more boys joined the group
= 6 + 3
= 9
New average height after 3 more boys joined the group
= 143 + 12
= 155 cm
Total height of 6 boys
= 6 x 143
= 858 cm
Total height of 9 boys
= 9 x 155
= 1395 cm
Total height of Luke, Ken and Fred
= 1395 - 858
= 537 cm
Answer(s): 537 cm
