12 is 20% of what number? 28 is 35% of what number? 84 is 42% of what number? 32 is 80% of what number? 35% of 60 is what number? 25% of 132 is what number? 5% of 40 is what number? 15% of 20 is what number? C

12 is 20% of 60

28 is 35% of 80

84 is 42% of 200

32 is 80% of 40

35% of 60 is 21

25% of 132 is 33

5% of 40 is 2

15% of 20 is 3

Step-by-step explanation:

For the first 4 situations, you need to multiply the first number by the reciprocal of the percentage as a fraction, which would be 100/(percent). Here's an example:

12 is 20% of x

x = 12*(100/20)

100/20 was used because that is the reciprocal of 20/100, which is 20% as a fraction out of 100.

For the last 4 situations, you just need to multiply the number by the percentage as a decimal. For example:

35% of 60 is x

x = 60*.35

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

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