The average height of a group of 6 boys is 110 cm. When Cole, Sam and Liam joined the group, the average height increased by 12 cm. What is Cole, Sam and Liam's total height?
| |
6 boys |
9 boys |
| Number |
6 |
9 |
| Value |
110 |
122 |
| Total value |
660 |
1098 |
Total number of boys after 3 more boys joined the group
= 6 + 3
= 9
New average height after 3 more boys joined the group
= 110 + 12
= 122 cm
Total height of 6 boys
= 6 x 110
= 660 cm
Total height of 9 boys
= 9 x 122
= 1098 cm
Total height of Cole, Sam and Liam
= 1098 - 660
= 438 cm
Answer(s): 438 cm
