jim gets a $20 allowance per week plus $25 for every lawn he mows.If he made $345 in one week how many lawns did he mow ?

Question

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Answer 1

This is a 2-step equation...

$25 per week per lawn. (the number of lawns could vary so that will be our variable "x".)

and he gets $20 allowance... this does not change so we will call it a constant

 

This week the number of lawns "times" 25 and his allowance = $345

Therefore...

25x + 20 = 345 

       - 20     -20

25x         = 325

Now divide both sides by the coefficient (25)... and that will be the number of lawns he mowed.