Question

5 shaving blades costs rs. 6.25 . Find the cost of 12 blades

Answer 1

We can solve this question easily by using the unitary method.

ATQ

5 shaving blades costs Rs. 6.25

==> 1 shaving blade costs Rs. 6.25/5

==> 12 shaving blades costs Rs. (6.25 / 5) * 12

                                                      = (6.25 * 12) / 5

                                                      = 75 / 5

                                                      = 15

Therefore, the cost of 12 such blades is Rs. 15.

Answer 2

Answer:

$\fbox\pink{Question}$

$\leadsto$ 5 shaving blades costs rs. 6.25 . Find the cost of 12 blades

$\fbox\pink{Given}$

$\leadsto$ Total shaving blades = 5

$\leadsto$ Cost of 5 shaving blades = Rs. 6.25

$\fbox\pink{To\:find}$

$\leadsto$ We have to find the cost of 12 shaving blades.

So, to know the cost of 12 shaving blades we need to know the cost of 1 blade

•°• Cost of 1 blade = $\frac{Cost \: of \: total \: blades}{total \: blades}$

$= \frac{6.25}{5}$

= 1.25

•°• Cost of 1 blade = Rs. 1.25

$\fbox\pink{Solution}$

Now we have to find the Cost of 12 blades

To find this the formula to be used is:-

$\leadsto$Cost of 1 blade × 12

= 1.25 × 12

= 15

•°• Cost of 12 blades = Rs. 15