The average height of a group of 5 girls is 118 cm. When Gwen and Xylia joined the group, the average height increased by 10 cm. What is Gwen and Xylia's total height?
| |
5 girls |
7 girls |
| Number |
5 |
7 |
| Value |
118 |
128 |
| Total value |
590 |
896 |
Total number of girls after 2 more girls joined the group
= 5 + 2
= 7
New average height after 2 more girls joined the group
= 118 + 10
= 128 cm
Total height of 5 girls
= 5 x 118
= 590 cm
Total height of 7 girls
= 7 x 128
= 896 cm
Total height of Gwen and Xylia
= 896 - 590
= 306 cm
Answer(s): 306 cm
