Q: What is a number so that 81 is 90 percent of that number?

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First, we can truncate the .00 off of the 90.00 to just make 90 for simplicity. Next, we take .10*90, which is 9. Subtract that from your original number, 90. 90-9=81. There is another way to do this problem. First, we have 100 percent, or 1. Next, we subtract 10 percent from that, or .1. 1-.1=.9, so we multiply .9*90=81.

10 percent of 90 is 9 so 30 percent will be 9 times 3 which is 27

20% of 450 is 90 So 80% of 450 will be 360

Percent is hundredths. So 81% =0.81

200% of a number is 90, so 100% of a nubmer is 45, so 45 is 80% 0f a number therfore a number is 45/80*100=225/4

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First, we can truncate the .00 off of the 90.00 to just make 90 for simplicity. Next, we take .10*90, which is 9. Subtract that from your original number, 90. 90-9=81. There is another way to do this problem. First, we have 100 percent, or 1. Next, we subtract 10 percent from that, or .1. 1-.1=.9, so we multiply .9*90=81.

10 percent of 90 is 9 so 30 percent will be 9 times 3 which is 27

20% of 450 is 90 So 80% of 450 will be 360

Percent is hundredths. So 81% =0.81

90

200% of a number is 90, so 100% of a nubmer is 45, so 45 is 80% 0f a number therfore a number is 45/80*100=225/4

I would type it with the percent sign, like so: 90%

3.5% is written 0.035, so multiply that with your original number:0.035*81 = 2.835

33 and 1/3 % is equivalent to 1/3. So multiplying anything that is that percentage of another number by 3, will give you the full number. In this case you get: Your answer is 81 27 * 3 = 81

40% means 40/100, which equals 0.40, so... 0.40 X 90 = 36

Answer 300 ---- Here is why: This is the same as asking .3x=90 so the number is 90/.3 =300 Note, 90/.3 is 90 divided by 3/10 which is 90x10=900 divided by 3.

100% - 10% = 90% so you multiply the number by 0.9