The average height of a group of 8 girls is 125 cm. When Risa and Kylie left the group, the average height decreased by 5 cm. What is Risa and Kylie's total height?
| |
8 girls |
6 girls |
| Number |
8 |
6 |
| Value |
125 |
120 |
| Total value |
1000 |
720 |
Total number of girls after 2 girls left the group
= 8 - 2
= 6
New average height after 2 girls left the group
= 125 - 5
= 120 cm
Total height of 8 girls
= 8 x 125
= 1000 cm
Total height of 6 girls
= 6 x 120
= 720 cm
Total height of Risa and Kylie
= 1000 - 720
= 280 cm
Answer(s): 280 cm
