The average cost of a pencil is ₹8, and the average cost of an eraser is ₹4. The cost of 8 erasers, 4 pencils, and 12 sharpeners is ₹148. The average cost of a sharpener is
₹____.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 7.
Cost of 8 erasers = 8 × 4 = 32
Cost of 4 pencils = 4 × 8 = 32
Let the cost of 12 sharpeners = 12x
⇒ 32 + 32 + 12x = 148
⇒ 64 + 12x = 148
⇒ 12x = 84
⇒ x = 7