An algebra problem by Vishnu Suresh

Algebra Level 1

A grocer has a sale of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs. 6500?

Rs. 5023 Rs. 4991 Rs. 4961 Rs. 2500

Vishnu Suresh by Vishnu Suresh , 25, India

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1 solution

Brett Hartley
Aug 18, 2014

WARNING: This question is likely to require a calculator
An average of Rs. 6500 for 6 months means that they had a sale of R s . 6500 ∗ 6 = R s . 39000 Rs. 6500*6=Rs. 39000 overall. Subtracting the 5 months from the total one at a time gives:

  1. 39000 − 6435 = 32565 39000-6435=32565
  2. 32565 − 6927 = 25638 32565-6927=25638
  3. 25638 − 6855 = 18783 25638-6855=18783
  4. 18783 − 7230 = 11553 18783-7230=11553
  5. 11553 − 6562 = R s . 4991 11553-6562=\boxed{Rs.4991}
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