2017 · Q57
An individual purchases three qualities of pencils. The relevant data is given below : Quality Price perpencil (in ₹) Money spent (in ₹) A 1.00 50 B 1.50 x C 2.00 20 It is known that the average price per pencil is ₹ 1.25. What is the value of x ?
Elementary MathematicsStatistics
- A₹ 10
- B₹ 30
- C₹ 40
- D₹ 60
Explanation
Pencils bought: 50 of A, x/1.5 of B, 10 of C; money spent: 70 + x. Average price (70+x)/(60 + 2x/3) = 1.25 gives 280 + 4x = 300 + 10x/3, so 2x/3 = 20 and x = 30: option B.