Question

2. A book seller supplied 115 textbooks and 1250 exercise books to a school. If the cost
of each textbook is 45 and the cost of each exercise book is *18, what is the amount
the school has to pay in all?​

Answer 1

Answer:

Let the cost of each notebook be 'x' and cost of each textbook be 'y'.

From the data given in the question, we can write the following equation:

3x + 2y = 135

However, it is given that a notebook costs Rs. 5 more than the textbook. Thus,

x = y + 5

Substituting this in the earlier equation, we get

3 (y+5) + 2y = 135

3y + 15 + 2y = 135

5y = 135 - 15

5y = 120

y = \frac{120}{5}5120 

y = 24

Substituting y=24 in any of the equations, we get

x = 24 + 5

x = 29

Thus, the cost of each notebook is Rs. 29 and the cost of each textbook is Rs. 24

You can also verify this answer by substituting the values of x and y as follows:

3(29) + 2 (24) = 135

87 + 48 = 135

135 = 135

Hence our solution is correct.