Question

14. Cost of 5 pens and 7 note books is 82 and cost
of 4 pens and 4 note books is 52. Find the cost
of 2 note books and 3 pens.
(a) *34.50
(b) 30.50
(c) 32.50
(d) 36.50
1​

Answer 1

Answer:

correct answer is ₹ 31

Step-by-step explanation:

Cost of 5 pens and 7 note books is Rs 82 and cost of 4 pens and 4 note books is Rs 52. Find the cost of 2 note books and 3 pens. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams. The cost a pen is Rs 5 less than half of the cost of book.

Answer 2

Answer:

b) 30.50

Step-by-step explanation:

Let pens be x

Let notebook and be y.

Therefore,

5x + 7y = 82 ------------- (1)

4x + 4y = 52

4(x+y) = 52

x+y = 52/4

x + y = 13

x = 13 - y ---------------(2)

Put (2) in equation (1)

5( 13 - y) + 7y = 82

After solving you get y = 8.5

Put y = 8.5 in (2)

x = 13 - 8.5

x = 4.5

Therefore,

Cost of 1 pen is Rs 4.5

Cost of 1 notebook is Rs 8.5

Therefore,

total cost of 3 pens and 2 notebooks is Rs 30.5