Question

14. If the cost of 20 packets of 12 pencils each is Rs 750 then the cost of 30
packets of 8 pencils each is
a) Rs 600
b) Rs 720
c) Rs 640
d) None of these​

Answer 1

(20 x 12 = 240) = Total Pencils
₹750 = Price Of Pencils
(30 x 8 = 240) = Price To Be Found Of

240 = 750
Then The Same Price Is For These Box
Hope It Helps You

Answer 2

Answer:

Cost of 30 packets of 8 pencils each = Rs.750

So , the option (d) is correct

Step-by-step explanation:

Given :

Cost of 20 packets 12 pencils each = Rs . 750

To find :

Cost of 30 packets 8 pencils each

Concept :

First find the total number of pencils in all the packets .

So , to find the cost use this equation -:

$\boxed{\sf{C_{30}=\dfrac{30\times8}{20\times12}\times C_{20}}}$

Where,

$\sf{C_{30}=Cost\:of\:30\:packets\:of\:8\:pencils\:each}$

$\sf{C_{20}=Cost\:of\:20\:packets\:of\:12\:pencils\:each}$

Solution :

$:\implies\sf{C_{30}=\dfrac{30\times8}{20\times12}\times Rs.750}$

$:\implies\sf{C_{30}=\cancel{\dfrac{240}{240}}\times Rs.750}$

$:\implies\sf{C_{30}=Rs.750}$

So , the cost of 30 packets of 8 pencils each is Rs.750 .