The average height of a group of 7 girls is 123 cm. When Esther and Jade left the group, the average height decreased by 3 cm. What is Esther and Jade's total height?
| |
7 girls |
5 girls |
| Number |
7 |
5 |
| Value |
123 |
120 |
| Total value |
861 |
600 |
Total number of girls after 2 girls left the group
= 7 - 2
= 5
New average height after 2 girls left the group
= 123 - 3
= 120 cm
Total height of 7 girls
= 7 x 123
= 861 cm
Total height of 5 girls
= 5 x 120
= 600 cm
Total height of Esther and Jade
= 861 - 600
= 261 cm
Answer(s): 261 cm
