Linda made some shortbreads. She sold ⁵₇ of them in the morning and ⁵₈ of the remainder in the evening. If she sold 30 more shortbreads in the morning than in the evening, how many shortbreads did she make altogether?

Morning	Remainder		Total
5x4	2x4		7x4
	Evening	Left
	5	3
20 u	5 u	3 u	28 u

Fraction of shortbreads left after selling some in the morning
= 1 - ⁵₇ 
= ²₇

Fraction of shortbreads sold in the evening
= ⁵₈ x ²₇
= ⁵₂₈

Make the denominators the same.
 ⁵₇ = ²⁰₂₈ 

Number of shortbreads that Linda sold in the morning = 20 u
Number of shortbreads that Linda sold in the evening = 5 u

Number of more shortbreads that Linda sold in the morning than in the evening
= 20 u - 5 u
= 15 u

15 u = 30

1 u = 30 ÷ 15 = 2

Total number of shortbreads that Linda made
= 28 u
= 28 x 2
= 56

Answer(s): 56