The average height of a group of 6 girls is 100 cm. When Jen and Julie joined the group, the average height increased by 5 cm. What is Jen and Julie's total height?
| |
6 girls |
8 girls |
| Number |
6 |
8 |
| Value |
100 |
105 |
| Total value |
600 |
840 |
Total number of girls after 2 more girls joined the group
= 6 + 2
= 8
New average height after 2 more girls joined the group
= 100 + 5
= 105 cm
Total height of 6 girls
= 6 x 100
= 600 cm
Total height of 8 girls
= 8 x 105
= 840 cm
Total height of Jen and Julie
= 840 - 600
= 240 cm
Answer(s): 240 cm
