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Explanation:

The amount of sugar in the cylinder = 1.5 litres

Now, 1.51-a102 is the amount of sugar

left after a litres has been replaced twice.

Now after replacement, sugar left is 10% of the total solution i.e.10% of 10 litres = 1 litre

∴ 1 = 1.51-a102

 0.66 = 1-a102

0.66 ≈ 0.8

∴ 0.8 = 1 - a10

∴ a10 = 0.2

∴ a = 2

Hence, option (d).

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