{(২/৩)/(৪/৫)} এর (২০/২১) = কত ?  

A ১/৩

B ৭/৮

C ৫/৬০

D ৮/২১

Solution

Correct Answer: Option B

{(২/৩)/(৪/৫)} এর (২০/২১) 

=> {(২/৩) / (১৬/২১)} 

=>  {(২/৩) ×(১৬/২১)}

=> {(২/৩) / (২১/১৬)}  = ৭/৮ 

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