a and b can together finish a work in 10 days. they worked together for 5 days and then b left. after another 5 days, a finished the remaining work. in how many days a alone can finish the job?  Choices
A) 10	B) 15	C) 20	D) 5	E) 30
<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<result>A</result>
a and b can together finish a work in 10 days. they worked together for 5 days and then b left. after another 5 days, a finished the remaining work. in how many days a alone can finish the job?
divide(multiply(5, 10), subtract(10, 5))
"a + b 5 days work = 5 * 1 / 10 = 1 / 2 remaining work = 1 - 1 / 2 = 1 / 2 1 / 2 work is done by a in 5 days whole work will be done by a in 5 * 2 = 10 days answer is a"