Use a comparison bar model: difference = $120.40, total = $651.80.<br><br>
[[model:questions/solutions/q4635.png]]<br><br>
&bull; Let February = 1 unit<br>
&bull; January = 1 unit + $120.40<br>
&bull; Total = 2 units + $120.40 = $651.80<br>
&bull; 2 units = $651.80 - $120.40 = $531.40<br>
&bull; 1 unit = $531.40 ÷ 2 = $265.70<br>
<br>
Max spent $265.70 on utilities in February.<br>
Check: Jan = 265.70 + 120.40 = 386.10. 265.70 + 386.10 = 651.80. ✓