To determine how many lawns Gio needs to mow to reach his savings goal of $900, we first need to find out how much more money he needs to save.
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Calculate the amount Gio needs to save: \[ \text{Amount needed} = \text{Goal} - \text{Current savings} = 900 - 250 = 650 \]
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Determine how many lawns he needs to mow: He earns $25 for each lawn he mows. To find out how many lawns he needs to mow to earn an additional $650, we divide the amount needed by the earnings per lawn: \[ \text{Number of lawns} = \frac{\text{Amount needed}}{\text{Earnings per lawn}} = \frac{650}{25} = 26 \]
Therefore, Gio needs to mow 26 lawns to reach his goal of $900.