4 times the number of A is equal to 5 times of the number of B, given that the number of B is 0.8, what is the number of A.
甲数的4倍等于乙数的5倍，已知乙数是0.8，甲数是多少．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">0.8 * (5/4)</gadget>
<output>1</output>

<result>1</result>