The average height of a group of 4 girls is 145 cm. When Kylie and Kathy joined the group, the average height increased by 2 cm. What is Kylie and Kathy's total height?
|
4 girls |
6 girls |
Number |
4 |
6 |
Value |
145 |
147 |
Total value |
580 |
882 |
Total number of girls after 2 more girls joined the group
= 4 + 2
= 6
New average height after 2 more girls joined the group
= 145 + 2
= 147 cm
Total height of 4 girls
= 4 x 145
= 580 cm
Total height of 6 girls
= 6 x 147
= 882 cm
Total height of Kylie and Kathy
= 882 - 580
= 302 cm
Answer(s): 302 cm