The average height of a group of 9 girls is 141 cm. When Vanessa and Tiffany joined the group, the average height increased by 2 cm. What is Vanessa and Tiffany's total height?
| |
9 girls |
11 girls |
| Number |
9 |
11 |
| Value |
141 |
143 |
| Total value |
1269 |
1573 |
Total number of girls after 2 more girls joined the group
= 9 + 2
= 11
New average height after 2 more girls joined the group
= 141 + 2
= 143 cm
Total height of 9 girls
= 9 x 141
= 1269 cm
Total height of 11 girls
= 11 x 143
= 1573 cm
Total height of Vanessa and Tiffany
= 1573 - 1269
= 304 cm
Answer(s): 304 cm
