*OPTIONS*1) 0.067

2) 0. 63

3) 0.133

4) 0.5

*Solution*Hundred more than one-fifth the square of Y is less than nine times Y.

∴ Y2 – 45Y + 500 < 0.

∴ (Y – 20)(Y – 25) < 0

∴ 20 < Y < 25

Now, there is only one value of Y (Y = 23), which satisfies the given condition.

There are 15 prime numbers less than 50: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 and 47.

Hence, option 1.

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