exam Maths Puzzle Numerical Ability

The second of three numbers is 4 times the first. THe third number is one more than the second. The sum of the numbers is 73. FInd the numbers

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I am trying to help my daughter with homework. Since it has been many years I have forgotten how to do. How to i anwer this ...Seperate $89 into two parts so that the second part is $4less than twice the first part. To meet the governments specifications, an alloy must be 65% aluminum. How many pounds each of a 70% aluminum alloy and a 54% aluminum alloy will be needed to produce 640 pounds of the 65% aluminum alloy?

Any help with this one is appreciated!