The growth of a medicinal plant of height 1 metre, is 1 cm/day and it is growing straight vertically upward. A man cuts 6 cm from the top, at a regular interval of every 11 days. Its height will be 2 metres after
(a)220 days
(b)250 days
(c)275 days
(d)None of these
Answer
Answer (as printed): D
Explanation
In 11 days, the height of the plant increases by (11-6) cm i.e., 5 cm. In (11 × 18) i.e., 198 days, the height of the plant increases by (5 × 18) i.e., 90 cm. In the next 10 days, the height of the plant increases by another 10 cm. So, in 208 days, the height of the plant will increase by $(90+10)=100 \mathrm{cm}$ or 1 m and become 2 m .