Question

An inner diameter of a car tyre is 15/4 cm and thickness of the type is 5/7 cm. what is the outer radius of the tyre ? ​

Answer 1

Diameter = 15/4

thickness = 5/7 =

Outer diameter = 15/4 + 5/7

Outer radius =(15/4 + 5/7) ÷ 2

Answer 2

From the given question the correct answer is:

the outer radius of the tire is 2.232cm or $\frac{4.464}{2}$cm.

Given :

inner diameter: $\frac{15}{4}$

thickness of the type:$\frac{5}{7}$

To find:

the outer radius of the tire

Solution:

we have to find outer radius of tire.

so ,

Outer Diameter = Inner diameter + Thickness of the tire

                           $=\frac{15}{4} +\frac{5}{7}\\\\=\frac{105+20}{28} \\\\=\frac{125}{28}\\\\=4.464cm$

Now , from the Outer diameter we can find the outer radious.

we know that, radius= 1/2 diameter

so, outer radius

$=\frac{1}{2} Outer diameter\\\\=\frac{1}{2} \times 4.464\\\\=2.232cm$

Hence , the outer radius of the tire is 2.232cm or $\frac{4.464}{2}$cm.