+65 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.)
+37159 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
