The ratio of A and B is 5:3. The sum of A and B is 160, what is A's number?
甲乙两数的比是5：3．甲乙的和是160，甲数是多少．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">160 * (5/8)</gadget>
<output>100</output>

<result>100</result>