Answer

Verified

346.5k+ views

**Hint:**Type of questions are basically based on linear equations in one variable. For the type of problems according to concept we have to assume the unknown value to some variable, then relate it with the given value according to the condition given in the question, through where we will get the relation in unknown and known value and by solving we will get the unknown value.

**Complete step-by-step solution:**

As in our case we have a red and white portion, as the red portion length is $1.8m$and white portion is three times that of red. So we can say that if we multiply three with the length of the red portion we will get the value equal to that of white portion, from here we will get the relation between unknown and known value and by further solving we will get the white portion length.

So moving ahead with the question we have;

Length of red portion given $=1.8m$

Let the length of white portion be $=x$(which is variable)

So according to the question we have white portion three times that of red, so in order to equate both if we multiply the red portion with three then we will have the red portion equal to that of red. So we can write it as; white portion$=$$3\times $red portion

\[\begin{align}

& white\text{ }portion=3\times red\text{ }portion \\

& x=3\times 1.8 \\

&\Rightarrow x=5.4 \\

\end{align}\]

Hence white portion is $5.4m$.

Now we find the length of pole which will be = Red portion+white painted portion=$1.8+5.4=7.2$

**Hence the pole is 7.2m long, so the option B is the correct option.**

**Note:**For the type of question we just had to find any relation between the values, on further solving we will get the answer. Moreover, as we had multiplied by three in the red portion to equate, we can also divide white portion by three to equate it to the red portion; that will also be right.

Recently Updated Pages

How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE

Why Are Noble Gases NonReactive class 11 chemistry CBSE

Let X and Y be the sets of all positive divisors of class 11 maths CBSE

Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE

Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE

Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE

Trending doubts

Which are the Top 10 Largest Countries of the World?

The 3 + 3 times 3 3 + 3 What is the right answer and class 8 maths CBSE

Fill the blanks with the suitable prepositions 1 The class 9 english CBSE

How many crores make 10 million class 7 maths CBSE

Difference Between Plant Cell and Animal Cell

Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE

Give 10 examples for herbs , shrubs , climbers , creepers

Change the following sentences into negative and interrogative class 10 english CBSE

Write a letter to the principal requesting him to grant class 10 english CBSE