Risa, Pamela and Vincent baked some croissants. Risa and Pamela baked ⁵₇ of the croissants. Pamela and Vincent baked ³₅ of the croissants. Risa and Vincent baked 552 croissants altogether.

1. What fraction of the croissants did Risa and Vincent bake altogether?
2. How many croissants did the three girls bake in total?

Risa	Pamela	Vincent	Total
5x5		2x5	7x5
2x7	3x7		5x7
14 u	11 u	10 u	35 u

(a)
The total number of croissants remains unchanged. Make the total number of croissants the same. LCM of 7 and 5 is 35.

Number of croissants baked by Pamela
= 21 u - 10 u
= 11 u

Number of croissants baked by Risa and Vincent
= 14 u + 10 u
= 24 u

Total number of croissants = 35 u

Fraction of the croissants baked by Risa and Vincent = ²⁴₃₅

(b)
Total number of croissants baked by Risa and Vincent = 24 u

24 u = 552

1 u = 552 ÷ 24 = 23

Total number of croissants baked
= 35 u
= 35 x 23
= 805

Answer(s): (a) ²⁴₃₅; (b) 805