Question 1069546
Her rate of earning money is:
{{{ 30/6 = 5 }}} dollars / car
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The formula you need is:
[ dollars earned ] = [ number of cars ] * [ dollars / car ]
Let number of cars = {{{ n }}}
{{{ 35 = n*5 }}}
{{{ n = 7 }}}
She must wash 7 cars to earn $35