Dana made some shortbreads. She sold ²₃ of them in the afternoon and ²₅ of the remainder in the evening. If she sold 80 more shortbreads in the afternoon than in the evening, how many shortbreads did she make altogether?

Afternoon	Remainder		Total
2x5	1x5		3x5
	Evening	Left
	2	3
10 u	2 u	3 u	15 u

Fraction of shortbreads left after selling some in the afternoon
= 1 - ²₃ 
= ¹₃

Fraction of shortbreads sold in the evening
= ²₅ x ¹₃
= ²₁₅

Make the denominators the same.
 ²₃ = ¹⁰₁₅ 

Number of shortbreads that Dana sold in the afternoon = 10 u
Number of shortbreads that Dana sold in the evening = 2 u

Number of more shortbreads that Dana sold in the afternoon than in the evening
= 10 u - 2 u
= 8 u

8 u = 80

1 u = 80 ÷ 8 = 10

Total number of shortbreads that Dana made
= 15 u
= 15 x 10
= 150

Answer(s): 150