Can some help me with this question: [-(+2)(-3)(-1)(+4)=]

-- A rectangle has 4 sides.

-- Each side has the same length as the side directly across from it.

-- So there are two sides that are both the width of the rectangle,
and another two sides that are both the length of the rectangle.

-- In this particular rectangle, when you add up all four sides,
the sum is 32 feet.

-- The width of the rectangle is 9 feet. So there are two sides that are
both 9 feet. When you add those up, you have 18 feet.

-- The REST of the 32 feet belongs to the other two sides.
That much is (32 - 18) = 14 feet. That's what the other two
sides add up to when you add them.

-- The other two sides are equal. So each of them is half of 14 = 7 feet .

This rectangle, or the description of it, is slightly weird.
The length of the rectangle is shorter than the width.
But that's OK. Two sides are 9 feet, and two sides are 7 feet, and
when you add them all up, you get 32 feet, so our solution is correct.
Let them call the sides anything they want to.

5 0

3 years ago

A dairy needs 365 gallons of milk containing 7% butterfat. How many gallons each of milk containing 9% butterfat and milk contai

azamat

The amount in gallons of each milk containing 9% butterfat and milk containing 4% butterfat which must be used to obtain the desired 365 gallons are;

219 gallons of 9% fat.
146 gallons of 7% fat.

<h3>What quantity of each type of milk is required for the desired 365 gallon?</h3>

It follows from the task content that the quantity of each type of milk required to arrive at the targeted fat content and quantity of milk are to be determined.

Let x = quantity of 9% fat milk and

Let y = quantity of 4% fat milk

Therefore, by mass balance; we have;

x + y = 365.

Where; y = 365 - x.

Also, by fat balance; we have;

(9% × x) + (4% × y) = (7% × 365)

9x + 4y = 2555

Therefore, the two equations to be solved simultaneously by substituting y from the first equation into the second equation as follows;

9x + 4 (365 - x) = 2555

5x = 1095

x = 1095/5