a and b together can do a work in 7 days. if a alone can do it in 56 days. in how many days can b alone do it?
Choose the correct option: A) 11 B) 8 C) 21 D) 20 E) 25
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 56</gadget>
<output>1/56 = around 0.017857</output>

<gadget id="calculator">(1/7) - (1/56)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / (1/8)</gadget>
<output>8</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8 + (2/5)</gadget>
<output>42/5 = around 8.4</output>

<result>B</result>
a and b together can do a work in 7 days. if a alone can do it in 56 days. in how many days can b alone do it?
add(inverse(subtract(divide(const_1, 7), divide(const_1, 56))), divide(const_2, add(const_2, const_3)))
"b 8 1 / 7 â € “ 1 / 56 = 1 / 8 = > 8"