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muminat
3 years ago
9

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 d

oes one doughnut cost?
Mathematics
1 answer:
anastassius [24]3 years ago
4 0
Difference in doughnuts = 50 - 40 = 10
Difference in money = 15 + 5 = 20

20 ÷ 10 = $2
Each doughnut costs $2

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

Each doughnut costs $2
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x = 7

Step-by-step explanation:

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3 years ago
Help please i don’t understand
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Thus :

\frac{9}{3}  =  \frac{6}{x}  \\

3 =  \frac{6}{x}  \\

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ira [324]

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If that's the case, then we have an equation in the form y = kx, where k is the constant of variation.

Solving for k gets us k = y/x

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Each row yields the value k = 0.25 and it fully confirms y does vary directly with x.

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