Question

Bamboo grows at a rate of $36\text{inches/day}$, it's height on a certain day is $1\text{feet}$, then it's height(in feet) after $6$ days is .

• A. $21$
• B. $19$
• C. $15$

Answer 1

The correct option is B $19$

Initial height of bamboo $=1\text{feet}$
It grows $36\text{inches}$ per day
$\therefore$ In $6$ days, it will grow by
$6\times 36\text{inch}=216\text{inches}$

We know the relation $1\text{feet}=12\text{inch}$ Or $1\text{inch}=\frac{1}{12}\text{feet}$
$\therefore 216\text{inch}=\frac{1}{12}\times 216\text{feet}=18\text{feet}$

$\therefore$ Height after $6$ days $=1+18\text{feet}=19\text{feet}$