The average height of a group of 7 girls is 120 cm. When Pamela and Jane left the group, the average height decreased by 9 cm. What is Pamela and Jane's total height?
| |
7 girls |
5 girls |
| Number |
7 |
5 |
| Value |
120 |
111 |
| Total value |
840 |
555 |
Total number of girls after 2 girls left the group
= 7 - 2
= 5
New average height after 2 girls left the group
= 120 - 9
= 111 cm
Total height of 7 girls
= 7 x 120
= 840 cm
Total height of 5 girls
= 5 x 111
= 555 cm
Total height of Pamela and Jane
= 840 - 555
= 285 cm
Answer(s): 285 cm
