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Question

Hi Kiasu Parents,

Please help to solve this question.

Thanks & Regards,

DNLNMUM

Answer

The total increase in the number of stationery from start to end is (137 – 117 = 20). Since we know that Kendrick gave away 25 pencils, he must have bought (20 + 25 = 45) more erasers in order to have an overall increase of 20 stationery in the end.

The additional 45 erasers led to a 60% increase in the total number of erasers. Therefore:

60% → 45 erasers
100% → 75 erasers at first

117 – 75 = 42 pencils


Check:

  # of pencils # of erasers Total
Before 42 pencils 75 erasers 117
Change -25 pencils +45 erasers (60% increase)  
After 17 pencils 120 erasers 137

 

1 Reply 0 Likes ✔Accepted Answer

Hi Adwin,

Thank you for the answer.

Regards,

DNLNMUM

0 Replies 0 Likes

Simultaneous equations and algebra

Let the eventual number of erasers be x, pencils be y at

x+y = 137

x-25+ y(100/160) = 117

Solve

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