The ratio of the amount of money spent by the mother to the amount of money saved in this month's income is 3:5, and the amount of money spent is 1200 yuan less than the amount of money saved. How much is mother's monthly income?
妈妈在本月的收入中支出的钱数和储蓄的钱数的比是3：5，支出的钱数比储蓄的钱数少1200元．妈妈本月的收入是多少元？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1_200 / (2/5)</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 1_200</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 + 3_000</gadget>
<output>4_800</output>

<result>4_800</result>