24 machines can do a work in 10 days. how many machines are needed to complete the work in 40 days?  Choose the correct option:
A) 10
B) 6
C) 4
D) 7
E) 5
<gadget id="calculator">24 * 10</gadget>
<output>240</output>

<gadget id="calculator">240 / 40</gadget>
<output>6</output>

<result>B</result>
24 machines can do a work in 10 days. how many machines are needed to complete the work in 40 days?
divide(multiply(24, 10), 40)
"required number of machines = 24 * 10 / 40 = 6 answer is b"