10th Grade Math =\?

Question

Im having a very hard time in math at the moment, and it doesn't help that my teacher can't explain these problems all too well...

Im asking somebody to please explain how to do these problems so that I can do the rest on my own...

All help is really appreciated, thank you

1. 27 equals 9% of ___
2. 40% of ___ = 20
3. 40% of ___ = 20
4. 8 = 4% of ___

Answer 1

You sound like you are trying to cheat.

Answer 2

1) 27 equals 9% of 300 Ans.
27 = (9/100) *x
x = 2700/9
x = 300

2) 40% of 50 = 20 Ans.
40/100*x = 20
x = 2000/40 = 50

3) 40% of 50 = 20

4) 8 = 4 % of 200 Ans
8 = 4/100*x
x =800/4 = 200

Answer 3

1 division problem you know you have 9% and you want 100% so divide 27 by 9 = 3 now this is 1% of your answer so now multiply by 100 3X100 = 300

2 and 3 You have the same Problem twice but here we go

It's the same as problem 1 your know what 40% of a number is so divide 20 / 40 = .5 that gives you 1% of the number so 0.5 X 100 = 50

50*.40= 20
4 Same thing find out what 1% is then multiply 100

8/4=2 2 is 1% of the number multiply 100. 2*100=200

200*.04= 8

Hope it clear if now leave an edit and I'll try to help.

Answer 4

call x everything you don't know:

27 = 9% of x
40% of x = 20
8 = 4% of x

use the percentages and ratios:
a percent is a 1/100 of a whole, or 0.01:
9% = 9/100, or 0.09

1) 27 = (9/100) * x /*(100/9) (dividing by a rational number -> 9/100, is the same as multiplication with the reciprocal of that rational number: 100/9)
27 * (100/9) = x
(27/9)*100 = x
3*100 = x
300 = x
check:
27 = (9/100) * 300
27 = 2700/100
27 = 27

2) and 3) are the same
40% of x = 20
(40/100) *x = 20 /* (100/40)
x = 20*(100/40)
x = 2000/40
x = 50

check
(40/100) * 50 = 20
2000/100 = 20
20 = 20
OK

4.)
8 = 4% *x
8 = (4/100) * x /*(100/4)
8*(100/4) = x
200 = x

check:
8 = 4% * 200
8 = (4/100) * 200
8 = 800/100
8 = 8
Ok

Answer 5

volume of each crate = 3 ft x 2 ft x 2 ft = 14 cu.ft. volume of truck = 24 ft x 8 ft x 10 ft = 1920 cu. ft. No of crates in truck = 1920 / 14 = one hundred sixty Estimate of calculators one hundred sixty x ninety two = 14720 to one hundred sixty x ninety six = 15360 yet in a distinctive thank you to look at this question: by using length the truck holds 24 ft / 3 ft = 8 crates by using width the truck holds 8 ft / 2 ft = 4 crates by using extreme the truck holds 10 ft / 2 ft = 5 crates finished cracks truck can carry = 8 x 4 x 5 = one hundred sixty Estimate comparable as above. you additionally can use the mean fee of calculators in each and each crate: (ninety two + ninety six) / 2 = ninety 4 Then the estimate would be ninety 4 x one hundred sixty = 15040

Answer 6

of means times .... is means equal ...
1) 27=.09x x = 27/.09
2) .40x = 20 x = 20/.4
3) 8 = .04x x = 8/.04


1 = 300
2= 50
3= 200