SOLUTION: Bob paid $3 less than Tim at a local pizza parlor. Together they spent $7.80. How much did Bob spend at the local pizza parlor?

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Bob paid $3 less than Tim at a local pizza parlor. Together they spent $7.80. How much did Bob spend at the local pizza parlor?
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Let T = amount Tim paid
T-3 = amount Bob paid
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From: "Together they spent $7.80" we get our equation:
T + (T-3) = 7.80
2T - 3 = 7.80
2T = 10.80
T = 5.40 (amount Tim paid)
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amount Bob paid:
T-3 = 5.40-3 = $2.40