Question

9. The cost of a pen and a ball pen are in the ratio of 7:5. If their total cost is rupees 48,
find the cost of each
10. Two numbers are in the ratio 3 : 4. If the smaller number is 84, find the bigger
number.
Answer with proper solution​

Answer 1

Answer:

Let the cost of a pen = Rs 7k. and cost of a ball pen is Rs.5k , accordingly :-

7k+5k = 48

or, 12k = 48 => k =48/12=4.

Cost of a pen = 7k = Rs.7×4 = Rs.28. , cost of a ball pen = 5k =5×4 =Rs.20. Answer.

Answer 2

Answer:

Total cost 12x = 48

x = 4

Cost of Pen 7x = 7*4 = 28 rupees

Cost of Ball Pen 5x = 5*4 = 20 rupees