Question

What is the thickness of a $2$-rupee coin if a stack of height $6cm$ is made by placing ten $2$-rupee coins one upon the other.

• A. $12mm$
• B. $6mm$
• C. $4mm$

Answer 1

The correct option is B

$6mm$

Step 1: We know that

Height of stack$=6cm$

$1cm=10mm$

$6cm=60mm$

So, height of stack$=60mm$.

Let thickness of a $2$-rupee coin be $xmm$

So, total thickness of ten $2$-rupee coin $=\left(10\times x\right)mm=10xmm$

Step 2:

According to the question,

Thickness of ten $2$-rupee$=$height of stack

$10x=60mm$

$x=\frac{60mm}{10}$

$x=6mm$

Hence, Option B is correct.