A shop sells pens and files only in packs. A pack of 3 pens cost $15. A pack of 7 files cost $21. A student wants to buy an equal number of pens and files. What is the least amount that the student must pay?

The cost of 1 folder, 2 notebooks and 5 pens is ₹45. The cost of 2 folders and 3 pens exceeds that of 4 notebooks by ₹17. Which of the following is sufficient to determine the cost of a pen?

. A pen and 12 erasers cost $17.70. A pen and 15 erasers cost $20.40. How much do 6 pens cost?

A man went to market with Ra.100.With that money he can buy 15 pencils or 25 pens.He kept 15% of that money for bus fare and with rest of the money he purchased 5 pencils,and 'x' pens. How many pens he purchased?

21 pencils and 29 pens cost Rs. 79. But, if the number of pencils and pens were interchanged, the cost would have reduced by Rs. 8. Find the cost of each pen.

A shop man bought pens at the rate of 7 for 10 and sold them at a profit of 40%. How many pens would a customer get for 10 ?Options3465