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Some friends have to gather money for a group trip. If each of them gives 90$, they will need 60$ more. If each of them gives 110$, they will have 60$ left. How many friends are in the group? (If you know the awnser explain how you got to it.)

 May 4, 2016
 #1
avatar+17183 
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X = number of friends

 

90 * x  +60  = amount needed

110 * x  - 60 = amount needed   

 

90*x +60 = 110 *x - 60    Add 60 to both sides of the equation

90x +120 = 110 x             Subtract 90 x from both

120 = 20x                        Divide by 20

6 = x = number of friends

 May 4, 2016
 #2
avatar+65 
0

Thanks alot!

Lunar  May 4, 2016

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