Question

Each day ,Robert eats 40% of the pistachios left in his jar at that time.At the end of the second day,27 pistachios remain.How many pistachios were in the jar at the start of the first day?

• A. 75
• B. 80
• C. 85
• D. 95

Answer 1

Answer: (A)

75

Let the initial no. of pistachios be$n$.

At the end of first day, remaining no.$=60\%\times n=0.6n$

At the end of second day, remaining no$=60\%\times 0.6n=0.36n$

$0.36n=27⟹n=75$

Hence, $75$ pistachios were in the jar at the start of the first day.