Ashutosh goes to buy 10 notebooks, 5 pencils and three erasers which cost Rs 430. Had he bought just 2 notebooks and one pencil it would have cost him Rs 74. If he started with Rs 400 and tried to buy 6 notebooks, 3 pencils and 5 erasers, how much money would he be left with?
Explanation:
Let n, l and e be the cost of notebook, pencil and eraser.
Hence, 10n + 5l + 3e = 430 …(1)
and 2n + l = 74
⇒ 10n + 5l = 74 × 5 = 370 …(2)
Solving (1) and (2)
⇒ 3e = 60 ⇒ e = 20.
We want the value of 6n + 3l + 5e = 3 × (2n + l) + 100 = 3 × 74 + 100 = 322
Hence, 400 – 322 = Rs. 78 would be left.
Hence, option (b).
» Your doubt will be displayed only after approval.
Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.