Question

Find the growth of the plant in 20 days if growth of a plant is directly proportional to the time taken.

• A. 60

Answer 1

The correct option is A 60
We have to find the growth of a plant in 20 days.

So, we need to find its growth for one day and then multiply the value with 20.

Let us represent growth by $y$ and time by $x$.


So,
$\text{Growth in 1 day}=\frac{y}{x}$
$=\frac{30}{10}$
$=3$

Number of days (x) = 20
So, when $x=20$,
$\text{Growth in 1 day}=\frac{y}{20}$
$\Rightarrow 3=\frac{y}{20}$
$\Rightarrow y=20\times 3$
$\Rightarrow y=60$

$\therefore \text{The growth of the plant in 20 days is}$
$\text{60 m}$.