The average height of a group of 8 girls is 117 cm. When Jen and Wendy joined the group, the average height increased by 3 cm. What is Jen and Wendy's total height?
| |
8 girls |
10 girls |
| Number |
8 |
10 |
| Value |
117 |
120 |
| Total value |
936 |
1200 |
Total number of girls after 2 more girls joined the group
= 8 + 2
= 10
New average height after 2 more girls joined the group
= 117 + 3
= 120 cm
Total height of 8 girls
= 8 x 117
= 936 cm
Total height of 10 girls
= 10 x 120
= 1200 cm
Total height of Jen and Wendy
= 1200 - 936
= 264 cm
Answer(s): 264 cm
