Question

If rs 420 is divided between 80 students and each boy gets rs6 and each girl gets rs4 . Find the number of boys

Answer 1

Answer:

【H】【e】【y】【a】

Step-by-step explanation:

Let the no. of boys = x

and no. of girls = y

So,

Acc. to ques,

6x + 4y = 420 -----(1)

and,

x + y = 80  

=> x = 80 - y -----(2)

Now,

Using eq. (2) in eq. (1),

=> 6x + 4y = 420

=> 6(80 - y) + 4y = 420......... (from 2)

=> 480 - 6y + 4y = 420

=> -2y = -60

=> \fbox{y=30}y=30​  

Also,

x + y = 80

=> x + 30 = 80

=>\fbox{x = 50}x=50​  

So,  

x = no. of boys = 30

and,

y = no. of girls = 50

_______-________________________

Answer 2

Hola mate

Answer:-

Let the no. of boys = x

and no. of girls = y

So,

Acc. to ques,

6x + 4y = 420 -----(1)

and,

x + y = 80

=> x = 80 - y -----(2)

Now,

Using eq. (2) in eq. (1),

=> 6x + 4y = 420

=> 6(80 - y) + 4y = 420......... (from 2)

=> 480 - 6y + 4y = 420

=> -2y = -60

=> \fbox{y=30}y=30

Also,

x + y = 80

=> x + 30 = 80

=>\fbox{x = 50}x=50

So,

x = no. of boys = 30

and,

y = no. of girls = 50

♥Hope it helps♥