D 21 a dozen is twelve so 2 dozens to a cup would be 21
9514 1404 393
Answer:
13
Step-by-step explanation:
Let n represent that number.
(2 +n)/(5 +n) = 5/6 . . . . . . . . n is added to numerator and denominator
6(2 +n) = 5(5 +n) . . . . . . . . . multiply by 5(5+n)
12 +6n = 25 +5n . . . . . . . . . eliminate parentheses
n = 13 . . . . . . . . . . . subtract 5n+12
Adding 13 to each term will give 5/6.
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<em>Check</em>
(2 +13)/(5 +13) = 15/18 = (3·5)/(3·6) = 5/6
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<em>Alternate solution</em>
The difference of denominator and numerator in 2/5 is 5-2 = 3. The difference of denominator and numerator in 5/6 is 6-5 = 1. In order to make the latter difference 3, we must have (3/3)(5/6) = 15/18. We can get 15/18 from 2/5 by adding 13 to numerator and denominator.
ANSWER
80 units²
EXPLANATION
One way to solve this is to find the area of the blue square and the subtract the areas of the red triangles:
The blue square is 12 units long by 12 units wide. Its area is:
Then, the area of the big triangle, which has a base 12 units long and a height of 10 units, is:
The smaller triangle has a base of 4 units and a heigth of 2 units. Its area is:
So the total area of the figure is:
Maybe a picture of what the assigment is can help me give you an answer?
