Question

If 11 pens and 19 pencils together cost rs.502 ,while 19 pens and 11 pencils together cost rs.758,how much 3 pens and 6 pencils cost together?

Solve this correctly and the answer is coming rs.141

Linear equation simultaneously chapter

Answer 1

heres ur answer mate
Hoe It Helps

Answer 2

Answer:

Step-by-step explanation:

let the cost of 1 pen be x

let the cost of i pencil be y

= 11x + 19y = rs 502 -equation 1

=19x + 11y = rs 758 -equation 2

adding and subtracting the above equations

after adding- 30x + 30y = 1260

= x + y =42= equation 3

after subtracting = 8x - 8y=256

= x-y=32 = equation 4

now subtract equation 4 from equation 1

=x+y=42

=x-y=32

-  +    -

= 2y=10

= y =5

now substitute y=5 in equation 3

=x+5=42

=x=42-5

=x=37

=3(x)+6(y)

=3(37)+6(5)

=111+30

=rs 141 is the answer