B's age is equal to A's (5/6), and A's age is equal to C's (4/3), it is known that B is 4 years older than C, find A's age.
乙的年龄相当于甲的(5/6)，甲的年龄又相当于丙的(4/3)，已知乙比丙大4岁，求甲的年龄．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(5/6) - (3/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">4 / (1/12)</gadget>
<output>48</output>

<result>48</result>