Question

19% of a plus 15% of b plus 26% of c is equal to 19% of a b and c together.it the difference between the twice of band thrice of c is equalvto 80. then find the 18.75% of c.​

Answer 1

Answer:

Given

19/100*a + 15/100*b + 26/100*c=19/100(a+b+c)

1/100(19a+15b+26c)=19/100(a+b+c)

19a+15b+26c=19a+19b+19c

15b+26c=19b+19c

7c=4b

4b-7c=0... (1)

Also given

2b-3c=80...(2)

From equation 1and 2

4b-7c=0

4b-6c=160 [(2)*2]

Solving..

c=160

So 18.75%of c is =160*18.75/100

=3000/100

=30