Irene and Usha used the same number of chocolate chips to bake cakes. Irene used ³₈ of her chocolate chips and Usha used ²₅ of her chocolate chips. They had a total of 93 chocolate chips at first.

1. How many chocolate chips did each girl use?
2. How many chocolate chips did both girls have left altogether?

	Irene	Usha	Total
Before	8x2 = 16 u	5x3 = 15 u	31 u
Change	- 3x2 = - 6 u	- 2x3 = - 6 u
After	5x2 = 10 u	3x3 = 9 u	19 u

(a)
Irene and Usha used the same number of chocolate chips to bake cakes.  Make the numerators the same. LCM of 3 and 2 is 6. 
3x28x2 of Mary's chocolate chips = 2x35x3 of Usha's chocolate chips 
616 of Mary's chocolate chips = 615 of Usha's chocolate chips 

Total number of chocolate chips at first
= 16 u + 15 u
= 31 u

31 u = 93

1 u = 93 ÷ 31 = 3

Number of chocolate chips that each girl used
= 6 u
= 6 x 3
= 18 

(b)
Total number of chocolate chips that both girls had left 
= 10 u + 9 u
= 19 u
= 19 x 3
= 57

Answer(s): (a) 18; (b) 57