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Question

   linda bought some pens from a bookshop.if she bought 10 pens,she would be left with $6. if she bought 15pens ,she would have $3.50short. how much money did linda have at first ?

Answer

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10 pens + 6 ——- 15 pens – 3.50
1 pen ——- (6 + 3.50)/(15 – 10) = 1.90

10 pens + 6 ——- 10 x 1.90 + 6 = 25
or
15 pens – 3.50 ——- 15 x 1.90 – 3.50 = 25

Ans : $25.

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This is Matrix question. 

   Group Left   Total
10 pen 10u 6 10u + 6
 15 pen 15u  – 3.5  15u – 3.5 

 

10u + 6 = 15u – 3.5

6 + 3.5 = 15u – 10u

5u = 9.5

1u = 9.5 ÷ 5 = 1.9

10u = 10 × 1.9 = 19

19 + 6 = $25

 

If you want to know more about this Table Method,  you may search “Table Method ” in this site.

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