The average height of a group of 9 girls is 133 cm. When Lynn and Marion left the group, the average height decreased by 2 cm. What is Lynn and Marion's total height?
| |
9 girls |
7 girls |
| Number |
9 |
7 |
| Value |
133 |
131 |
| Total value |
1197 |
917 |
Total number of girls after 2 girls left the group
= 9 - 2
= 7
New average height after 2 girls left the group
= 133 - 2
= 131 cm
Total height of 9 girls
= 9 x 133
= 1197 cm
Total height of 7 girls
= 7 x 131
= 917 cm
Total height of Lynn and Marion
= 1197 - 917
= 280 cm
Answer(s): 280 cm
