Sabrina made some biscuits. She sold ⁴₅ of them in the afternoon and ³₁₀ of the remainder in the evening. If she sold 259 more biscuits in the afternoon than in the evening, how many biscuits did she make altogether?

Afternoon	Remainder		Total
4x10	1x10		5x10
	Evening	Left
	3	7
40 u	3 u	7 u	50 u

Fraction of biscuits left after selling some in the afternoon
= 1 - ⁴₅ 
= ¹₅

Fraction of biscuits sold in the evening
= ³₁₀ x ¹₅
= ³₅₀

Make the denominators the same.
 ⁴₅ = ⁴⁰₅₀ 

Number of biscuits that Sabrina sold in the afternoon = 40 u
Number of biscuits that Sabrina sold in the evening = 3 u

Number of more biscuits that Sabrina sold in the afternoon than in the evening
= 40 u - 3 u
= 37 u

37 u = 259

1 u = 259 ÷ 37 = 7

Total number of biscuits that Sabrina made
= 50 u
= 50 x 7
= 350

Answer(s): 350