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.
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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
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