2015年1月7日 · You can miss 20% of the questions and score 80%. So you can miss (20%)(30) which equals 6. The answer is 6.

2015年8月7日 · this gives us( 30×5)/(100×3) = 60/100 x. ie 1/2 =3/5x . 5x= 6 . x =6/5 . Upvote ...

2014年10月15日 · A math problem that is a word problem that i need solved, if 30% of a given number is 45, what is 80% of the given number

started at an 80%. It dropped 14% after one test, but at the end of the semester, it rose 20%. What was Marci’s overall gain or loss? Solution: Notice again that this involves a dropped, or decreased, percent and then an increased percent, so our equation would look like this: …

Holly K. asked • 08/31/15 how many gallons of a 90% antifreeze solution must be mixed with 100 gallons of 25% antifreeze to get a mixture of 80% antifreeze?

2015年9月16日 · So let x = the amount of the 60% solution, and y = the amount of the 30% solution. First of all, you know that x + y = 300, because after they are mixed you want to have 300 ml of the 50% solution. Second, look at how much acid is in each of the starting solutions and how much is in the ending solution.

Haven D. asked • 09/10/18 How many gallons of a 90% antifreeze solution must be mixed with 70 gallons of 10% antifreeze to get a mixture that is 80% antifreeze?

2024年11月5日 · To prepare an 80% glycerol solution, you would mix 80 parts glycerol with 20 parts water. For example, you could mix 80 mL of glycerol with 20 mL of water to make 100 mL of an 80% glycerol solution.

2021年10月15日 · Make an equation for the volume using X for gallons of 80% added to 80 gallons of the 15%: Volumes: x + 80 = x + 80. Now make an equation for the concentrations times their respective volumes, be sure to put the % into decimal form, as follows: Concentrations: x*(0.80) + 80*(0.15) = (x + 80)*(0.70) NOW SOLVE for x: x*(0.80) + 80*(0.15) = (x ...

2012年12月20日 · The decimal form of 80% is .80 meaning you have 80 parts of 100 so the fraction would be expressed as 80/100. Then this fraction can be further reduced, first I would devide both the numerator and denominator by ten so you are left with 8/10 which can be further reduced. So I would devide bothe the Num. and dem. by 2 and would end up with 4/5.