Simplest form of a fraction

Which one of the following fraction after reducing in simplest form is not equal to 3/2?

a) 15/20
b) 12/8
c) 27/18
d) 6/4

Result

x = (Correct answer is: a)

Step-by-step explanation:

$$\begin{gathered} f=3\mathrm{/}2={\displaystyle \frac{3}{2}}=1\frac{1}{2}=1.5 \\ a=15\mathrm{/}20={\displaystyle \frac{3}{4}}=0.75 \\ b=12\mathrm{/}8={\displaystyle \frac{3}{2}}=1\frac{1}{2}=1.5 \\ c=27\mathrm{/}18={\displaystyle \frac{3}{2}}=1\frac{1}{2}=1.5 \\ d=6\mathrm{/}4={\displaystyle \frac{3}{2}}=1\frac{1}{2}=1.5 \\ a\mathrm{\ne }f \\ f=b,f=c,f=d \\ x=a \end{gathered}$$

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