The average height of a group of 7 girls is 135 cm. When Lynn and Dana left the group, the average height decreased by 5 cm. What is Lynn and Dana's total height?
| |
7 girls |
5 girls |
| Number |
7 |
5 |
| Value |
135 |
130 |
| Total value |
945 |
650 |
Total number of girls after 2 girls left the group
= 7 - 2
= 5
New average height after 2 girls left the group
= 135 - 5
= 130 cm
Total height of 7 girls
= 7 x 135
= 945 cm
Total height of 5 girls
= 5 x 130
= 650 cm
Total height of Lynn and Dana
= 945 - 650
= 295 cm
Answer(s): 295 cm
