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? - IQ786

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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?

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?

75

80

90

40

Explanation

Let the initial no. of pistachios be $n$ .
At the end of first day, remaining no. $= 60 % \times n = 0.6 n$
At the end of second day, remaining no $= 60 % \times 0.6 n = 0.36 n$
$0.36 n = 27 ⟹ n = 75$
Hence, $75$ pistachios were in the jar at the start of the first day.