4
2
5
3
Correct answer is C
402y=102ten
⇒ 4 x y2 + 0 x y1 + 2 x y0 = 102
⇒ 4y2 + 0 + 2 x 1 = 102
⇒ 4y2 + 2 = 102
⇒ 4y2 = 102 - 2
⇒ 4y2 = 100
⇒ y2=1004
⇒ y2 = 25
∴ y = √25 = 5
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