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How much of an alloy that is 10 percent copper should be mixed with an alloy that is 80 percent copper in order to get an alloy that is 30 percent copper?
Let me reduce that to an equation for you: 10x + 80(1-x) = 30; solve for x.
What percent of 76 is 57?
is/of=%/100...it is a proportion problem. 57/76=%/100----->57/76=x/100 76x=5700 Then divide by 76 on both sides of the = sign. your answer should come out to: 75%
What is the equation on how to figuar out 25 percent of 100?
100 divided by 100/25. JHC! I think you should go back over the meaning of "per cent"
In what proportion should 95 percent percent alcohol be mised with 30 percent percent alcohol to make 70 percent percent?
x = volume of 95% y = volume of 30% so (x+y) is volume of 70% 0.95 x + 0.30 y = 0.70(x+y) 0.95 x + 0.30 y = 0.70x + 0.70y 0.25x = 0.40y x/y = 0.40/0.25 = 8/5 for every 8 volumes of 95% mix in 5 volumes of 30%the volumes can be ml, liters, cups, pints etc.
How do you find a percent of a number if you know another percent?
To find out the percent of a number if you know another percent you do. . . the method of Cross-Mutltiplying and Dividing, for example let's say I got 23/25 on a math test and I want to know my percentage so X/100, your equation should look something like 23/25 = x/100. now that you got your equation let's do the math. Do 23 x 100 (23 multiplied by 100) then you get an answer of 2300. You would then divide 2300 by 25 and get your answer of 92%. That's basically why this method is called cross multiplying and dividing.
