The average height of a group of 8 girls is 110 cm. When Nicole and Zara joined the group, the average height increased by 11 cm. What is Nicole and Zara's total height?
|
8 girls |
10 girls |
Number |
8 |
10 |
Value |
110 |
121 |
Total value |
880 |
1210 |
Total number of girls after 2 more girls joined the group
= 8 + 2
= 10
New average height after 2 more girls joined the group
= 110 + 11
= 121 cm
Total height of 8 girls
= 8 x 110
= 880 cm
Total height of 10 girls
= 10 x 121
= 1210 cm
Total height of Nicole and Zara
= 1210 - 880
= 330 cm
Answer(s): 330 cm