Patrick B. answered • 02/13/19
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4.7
(31)
Math and computer tutor/teacher
X-18 = 2 (X-25)
x-18 = 2x - 50
-18 = x - 50
32 = x
check
32-18 = 14 = 2(32-25) = 2*7
32 is the answer
Joe C.
Ahh...I get it now. Lily's amount is equal to twice Sara's amount. So you have to multiply Sara's amount by 2. Now here is the kicker, this is a word problem from Singapore 5a math curriculum. In 5a algebra hasn't been introduced to the student yet. How do you solve this without algebra?
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09/19/19
Joe C.
I had it as 2(x-18) = (x-25)...I don't understand why you multiply sara's side by 2 and not lily's. It is lily that has twice as much money after they spend money.09/19/19