Lisa guessed the number of marbles in a jar, but guessed `35` too many. Her friend Gemma guessed `15` too few. The average of both guesses was `180`. How many marbles are in the jar?
(170)
Hint
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A word problem can be translated into an equation for easier solving.
First, represent the components of the problem
number of marbles: `x`
Lisa’s guess: `x+35`
Gemma’s guess: `x-15`
Translate the problem into an equation using the representations above
Remember that to find the average of a number, get their sum and divide it by `2`
