Introduction to Linear Polynomials | Exercise 2.2

Question 6

A farmer cuts a 300 feet fence into two pieces of different sizes. The longer piece is four times as long as the shorter piece. How long are the two pieces?

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Solution

We will use a variable to represent the unknown lengths and form an equation.

Step 1 — Define variables and form the equation

Let's say the shorter piece is xx feet long.

The longer piece is four times the shorter piece.

So, the longer piece is 4x4x feet long.

The total length of the fence is 300 feet.

We add the lengths of the two pieces to get the total.

x+4x=300x + 4x = 300

5x=3005x = 300

5x=300\boxed{5x = 300}

Diagram 1

Step 2 — Find the length of the shorter piece

Now, we need to solve for xx.

We divide both sides of the equation by 5.

x=3005x = \frac{300}{5}

x=60x = 60

x=60 feet\boxed{x = 60 \text{ feet}}

Step 3 — Find the length of the longer piece

The longer piece is 4x4x.

We substitute the value of xx we found.

4×604 \times 60

=240= 240

240 feet\boxed{240 \text{ feet}}

Answer

(i) The shorter piece is 60 feet long. (ii) The longer piece is 240 feet long.

More questions in Exercise 2.2

Q1

Find the value of the linear polynomial 5x35x - 3 if:

(i) x=0x = 0 (ii) x=1x = -1 (iii) x=2x = 2

Q2

Find the value of the quadratic polynomial 7s24s+67s^2 - 4s + 6 if:

(i) s=0s = 0 (ii) s=3s = -3 (iii) s=4s = 4

Q3

The present age of Salil's mother is three times Salil's present age. After 5 years, their ages will add up to 70 years. Find their present ages.

Q4

The difference between two positive integers is 63. The ratio of the two integers is 2:5. Find the two integers.

Q5

Ruby has 3 times as many two-rupee coins as she has five rupee-coins. If she has a total ₹88, how many coins does she have of each type?

Q6

A farmer cuts a 300 feet fence into two pieces of different sizes. The longer piece is four times as long as the shorter piece. How long are the two pieces?

Q7

If the length of a rectangle is three more than twice its width and its perimeter is 24 cm, what are the dimensions of the rectangle?

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