Ivory and Tiffany used the same number of chocolate chips to bake cakes. Ivory used
37 of her chocolate chips and Tiffany used
47 of her chocolate chips. They had a total of 343 chocolate chips at first.
- How many chocolate chips did each girl use?
- How many chocolate chips did both girls have left altogether?
|
Ivory |
Tiffany |
Total |
Before |
7x4 = 28 u |
7x3 = 21 u |
49 u |
Change |
- 3x4 = - 12 u |
- 4x3 = - 12 u |
|
After |
4x4 = 16 u |
3x3 = 9 u |
25 u |
(a)
Ivory and Tiffany used the same number of chocolate chips to bake cakes. Make the numerators the same. LCM of 3 and 4 is 12.
3x47x4 of Mary's chocolate chips =
4x37x3 of Tiffany's chocolate chips
1228 of Mary's chocolate chips =
1221 of Tiffany's chocolate chips
Total number of chocolate chips at first
= 28 u + 21 u
= 49 u
49 u = 343
1 u = 343 ÷ 49 = 7
Number of chocolate chips that each girl used
= 12 u
= 12 x 7
= 84
(b)
Total number of chocolate chips that both girls had left
= 16 u + 9 u
= 25 u
= 25 x 7
= 175
Answer(s): (a) 84; (b) 175