Xandra made some croissants. She sold ²₅ of them in the afternoon and ⁴₉ of the remainder in the evening. If she sold 18 more croissants in the afternoon than in the evening, how many croissants did she make altogether?

Afternoon	Remainder		Total
2x3	3x3		5x3
	Evening	Left
	4	5
6 u	4 u	5 u	15 u

Fraction of croissants left after selling some in the afternoon
= 1 - ²₅ 
= ³₅

Fraction of croissants sold in the evening
= ⁴₉ x ³₅
= ⁴₁₅

Make the denominators the same.
 ²₅ = ⁶₁₅ 

Number of croissants that Xandra sold in the afternoon = 6 u
Number of croissants that Xandra sold in the evening = 4 u

Number of more croissants that Xandra sold in the afternoon than in the evening
= 6 u - 4 u
= 2 u

2 u = 18

1 u = 18 ÷ 2 = 9

Total number of croissants that Xandra made
= 15 u
= 15 x 9
= 135

Answer(s): 135