Question

Ravi has some money. If he buys 40 doughnuts, he will have $5 left. If he buys 50 doughnuts,he will need another $15. How much does one doughnut cost?

Answer 1

Difference in doughnuts = 50 - 40 = 10
Difference in money = 15 + 5 = 20

20 ÷ 10 = $2
Each doughnut costs $2

Check:
40 x 2 + 5 = $85
50 x 2 -15 = $85
Ravi has $85 at first.

Each doughnut costs $2

Answer 2

The cost of one Donut from the purchases made is; $2

What is the cost of the item?

If he buys 40 donuts, he will have $5 left. Thus;

Amount he had initially is; 40x + 5

where x is amount of each donut

He buys 50 donuts, he will need $15 to make it up.

Thus, amount he had initially is; 50x - 15

Thus;

50x - 15 = 40x + 5

50x - 40x = 15 + 5

10x = 20

x = $2

Thus, each donut costs $2

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