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sergey [27]
3 years ago
14

A cook uses fifteen 2litter bottles of cooking oil in a week. If he decides to buy 5 litter tins of cooking oil instead how many

tins of cooking oil will he use over a 10 week period if the rate at which he uses it remains unchanged.
Mathematics
1 answer:
Nata [24]3 years ago
8 0

Answer:

300 liters

Step-by-step explanation:

If he uses 15, 2 liter bottles in a week,

then 15 * 2 = 30 liters in a week.

If he uses the same rate in 10 weeks then,

10 * 30 = 300 liters

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Answer:

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Step-by-step explanation:

Solve the following system:

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Hint: | Choose an equation and a variable to solve for.

In the first equation, look to solve for z:

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Hint: | Solve for z.

Subtract x - 3 y from both sides:

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Hint: | Perform a substitution.

Substitute z = -15 - x + 3 y into the second and third equations:

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Hint: | Expand the left hand side of the equation x + y + 2 (-15 - x + 3 y) = 1.

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{z = -15 - x + 3 y

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Hint: | Choose an equation and a variable to solve for.

In the second equation, look to solve for x:

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-30 - x + 7 y = 1

Hint: | Isolate terms with x to the left hand side.

Subtract 15 - 2 y from both sides:

{z = -15 - x + 3 y

3 x = 2 y - 17

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Hint: | Solve for x.

Divide both sides by 3:

{z = -15 - x + 3 y

x = (2 y)/3 - 17/3

-30 - x + 7 y = 1

Hint: | Perform a substitution.

Substitute x = (2 y)/3 - 17/3 into the third equation:

{z = -15 - x + 3 y

x = (2 y)/3 - 17/3

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Hint: | Choose an equation and a variable to solve for.

In the third equation, look to solve for y:

{z = -15 - x + 3 y

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Hint: | Perform a back substitution.

Substitute x = -3 into the first equation:

{z = 0

x = -3

y = 4

Hint: | Sort results.

Collect results in alphabetical order:

Answer:  {x = -3 , y = 4 , z = 0

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