<PRE><B>Question 991130</B>
sarah saves 2 dollars for every 5 dollars her brother saves.


sarah saved 20 dollars.


20 / 2 * 5 = 50 dollars.


her brother saved 50 dollars.


look at it another way.


if she saves 2 dollars, her brother saves 5.


20 dollars is 10 * 2.


she saved 10 * 2 = 20 dollars.


her brother must have saved 10 * 5 = 50 dollars.


look at it another way.


brother saves 5 dollars for every 2 dollars that she saves.


that means her brother saves 2.5 dollars for every 1 dollar that she saves because 5/2 = 2.5 and 2/2 = 1.


she saved 20 dollars.


he must have saved 2.5 * 20 = 50.


in ratio form the equation would be:


5/2 = x / 20


x represent how much her brother saved.


cross multiply to get 100 = 2*x.


solve for x to get x = 50








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