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lesantik [10]
3 years ago
12

The ratio of pencils to erasers is 4:1 if there are 20 pencils how many erasers are there?

Mathematics
1 answer:
shusha [124]3 years ago
8 0
If the ratio is 4:1 , pencils being the 4 and erasers being the 1, there are 4 pencils for every 1 eraser. Now, substitute the 4 pencils for 20 pencils. How do you get to 20 from 4? multiply by 5. You multiply the 4 pencils by 5 to get 20, and u multiply the 1 eraser by 5 to get 5, so there are 20 pencils: 5 erasers
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kenny6666 [7]
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60 ÷ 20 = 3

Now we will multiply to find the trains speed in miles per hour. 

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3 years ago
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kati45 [8]

Answer:

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Step-by-step explanation:

65 miles per hour for 2 hours — 65+ 65 = 130

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Answer:

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a-1/2= ±i/2 sqrt(47)

Add 1/2 to each side

a-1/2+1/2 = 1/2± i/2 sqrt(47)

a =  1/2± i/2 sqrt(47)

a = 1/2 (1 ±sqrt(47))

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