The basic price of residential electricity in a certain place is a yuan per watt-hour. If the monthly electricity consumption exceeds 120 kwh, the excess part will be charged at b yuan per watt-hour. It is known that Xiaoming's family used 118 kWh of electricity in February, and the electricity bill was 70.8 yuan. In March, the electricity consumption is 135 kWh, and the electricity bill is 88.5 yuan. If the electricity bill paid by Xiao Ming's family in April is 83 yuan, how many kWh is the electricity consumption of his family in April?
某地居民生活用电基本价格为每个瓦时a元，若每月用电超过120千瓦时，则超出部分按每个瓦时b元计费．已知小明家二月份用电118千瓦时，交电费70.8元．三月用电135千瓦时，交电费88.5元．若小明家四月伤所交的电费为83元，则他家四月伤的用电量是多少千瓦时？
<gadget id="calculator">70.8 / 118</gadget>
<output>0.6</output>

<gadget id="calculator">120 * 0.6</gadget>
<output>72</output>

<gadget id="calculator">83 - 72</gadget>
<output>11</output>

<gadget id="calculator">88.5 - 72</gadget>
<output>16.5</output>

<gadget id="calculator">135 - 120</gadget>
<output>15</output>

<gadget id="calculator">16.5 / 15</gadget>
<output>1.1</output>

<gadget id="calculator">11 / 1.1</gadget>
<output>10</output>

<gadget id="calculator">120 + 10</gadget>
<output>130</output>

<result>130</result>