A baker ordered 10 kg of premium flour and some additional kg of standard…
2025
A baker ordered 10 kg of premium flour and some additional kg of standard flour. The price of premium
flour per kg was twice that of the standard flour. Due to an ordering error, the quantities of the two types of flour
were interchanged. This decreased the total cost by 25%. Find the ratio of the quantity of premium flour to
standard flour in the original order.
- A.
1:2
- B.
5:2
- C.
3:4
- D.
4:5
Attempted by 16 students.
Show answer & explanation
Correct answer: B
Let standard flour cost be s per kg, so premium costs 2s. If standard quantity is q, original cost = 20s + qs. Interchanged cost = 2qs + 10s. Given this is 25% less: 2q + 10 = 0.75(20 + q), so q = 4. Original quantity ratio = 10 : 4 = 5 : 2.