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erastovalidia [21]
2 years ago
7

Silvergrove middle school spent $60 to purchase 4 work books. How many these workbooks can they buy for $90? Solve using unit ra

tes.
Mathematics
1 answer:
cluponka [151]2 years ago
6 0
They can buy 6 workbooks with $90. To find the unit rate we simply divide the cost ($60) by the number of books (4). That gives us $15, the cost of 1 workbook. So now to find out how many workbooks can be purchased with $90, we divide 90 by 15. That’s how I got 6 workbooks. Hope this helps.
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Casey is six times as old as Ralph. In two years, she will be four times as old as Ralph. How old is each of them now?
lisov135 [29]

Ralph is 3 years old

Casey is 18 years old

Step-by-step explanation:

Let the age of Ralph be x

Then Casey is 6 times as old as Ralph will be 6x

In two years

Ralph =x+2

Casey=6x+2 ⇒ 4(x+2)

Equate the two equations for Casey as

6x+2 = 4x+8

6x-4x=8-2

2x=6

x=6/2= 3

Current age;

Ralph= x= 3 years old

Casey=6x = 6*3= 18 years

Learn More

Forming expressions and solving equations;brainly.com/question/1280754

Keywords :six, times, years

#LearnwithBrainly

4 0
3 years ago
Plss help I’ll mark brainliest
melamori03 [73]

Answer:

D 6

Step-by-step explanation:

Normally when I multiply mixed numbers, I change them to improper fractions first so that it is easier.

1\frac{2}{10} × 5 = \frac{12}{10} × 5

Multiply 5 by the numerator of the fraction and leave the denominator alone.

\frac{12}{10} × 5 = \frac{60}{10}

Change back to simplest form.

\frac{60}{10} = 6

4 0
2 years ago
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n200080 [17]

Answer:

B) 120

Step-by-step explanation:

180 - 60 = 120

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2 years ago
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The first term of an arithmetic sequence is -5, and the tenth term is 13. Find the common difference.
Sergeeva-Olga [200]
(A) 1.8

The difference is 18, 13 is bc the tenth term so divide 18 by 10 to get 1.8
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A study showed that the ratio of the number of people
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