The average height of a group of 8 girls is 129 cm. When Vanessa and Abi left the group, the average height decreased by 11 cm. What is Vanessa and Abi's total height?
| |
8 girls |
6 girls |
| Number |
8 |
6 |
| Value |
129 |
118 |
| Total value |
1032 |
708 |
Total number of girls after 2 girls left the group
= 8 - 2
= 6
New average height after 2 girls left the group
= 129 - 11
= 118 cm
Total height of 8 girls
= 8 x 129
= 1032 cm
Total height of 6 girls
= 6 x 118
= 708 cm
Total height of Vanessa and Abi
= 1032 - 708
= 324 cm
Answer(s): 324 cm
