Question

In a shop, an exercise book costs K700 more than a pen. Given that an exercise costs x kwacha and a pupil bought 6 exercise books and 2 pens and paid K7400, find:
a) The cost of a pen in terms of x 
b) The cost of an exercise book

Answer 1

Answer:

Let say price of one book is X, and price of one pen is Y.

2X+3Y =225

3x+4Y= 320

By multiplying 3 in equation 1 and multiplying 2 in equation 2

6X+9Y =675

6X +8Y = 640

So by elimination method Y is equal to 35.

The cost of one pen is Rs 35

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