The easiest way to do this is to divide $5.25 from $60.25. You should get $55. Then, subtract 5.25 3 times from $55. You should get $39.25. So, their lunch costed $39.25. But, we are not done! The question says to write a equation, so we need a variable! So the real answer would be $55-$5.25-$5.25-$5.25=x. x=$39.25.Remember, don't forget your money symbol!!!!