The cost of an earaser is 80 paise and the cost of a pencil is Rs 2. What is the ratio of their costs in simplest form?

The cost of an eraser is 80 paise and the cost of pencile is rupees 2 what is the ratio of their cost in simplest form.

If the cost of 30 pencils is Rs. 240, what is the cost of 18 pencils?

The cost of 1 pen is Rs. 16 and the cost of 1 pencil is Rs. 5. What is the total cost of x pens and y pencils.

If the cost of 4 pencils is Rs 8, find the cost of 7 pencils.

Cost of a dozen pens is Rs 180 and the cost of 8 pencils is Rs 56. Find the ratio of the price of one pen to the price of one pencil.

If the cost of 12 pencils is Rs 24, then find the cost of 10 pencils.