When Lingling and Honghong were calculating a division problem, Lingling calculated 4.5 divided by a number and the correct result was a, but Honghong regarded the divisor 4.5 as 5.4, and the calculated quotient was 1.5 greater than a. You know that the problem is correct What is the result?
玲玲和红红在计算一道除法题时，玲玲算得4.5除以一个数的正确结果是a，红红却将被除数4.5看成了5.4，结果算得的商比a大1.5，你知道这道题正确的结果是多少吗？
<gadget id="calculator">5.4 - 4.5</gadget>
<output>0.9</output>

<gadget id="calculator">0.9 / 1.5</gadget>
<output>0.6</output>

<gadget id="calculator">4.5 / 0.6</gadget>
<output>7.5</output>

<result>7.5</result>