Gabby bought some gifts for her siblings at an average price of $11.20. If Gabby decided to buy a pen which cost $12 for her father and a bag which cost $40 for her mother, the average price of the gifts would become $14.90. How many gifts did Gabby buy for her siblings?
| |
Siblings |
Siblings and parents |
| Number |
1 u |
1 u + 2 |
| Value |
11.20 |
14.90 |
| Total Value |
11.20 u |
14.90 u + 29.80 |
Number of gifts that Gabby bought for her siblings = 1 u
Amount that Gabby spent on the gifts for her siblings
= 1 u x 11.20
= 11.20 u
Amount that $(Lizy) spent if she bought for her parents
= 12 + 40
= $52
Total number of items bought if she bought for her parents and her siblings
= 1 u + 1 + 1
= 1 u + 2
Total amount that she spent if she bought for her parents and her siblings
= 14.90(1 u + 2)
= 14.90 u + 29.80
11.2 u + 52 = 14.90 u + 29.80
14.90 u - 11.2 u = 52 - 29.80
3.7 u = 22.20
1 u = 22.20 ÷ 3.7 = 6
Number of gifts that she bought for her siblings
= 1 u
= 6
Answer(s): 6
