if 4A=5B=7C and A+B+C=581,C=?
priyalj339:
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given that,
4A = 5B = 7C
A + B + C = 581. (i)
7C = 4A
so
A = 7C/4
7C = 5B
so
B = 7C/5
putting value of A and B in (i)
7C/4 + 7C/5 + C = 581
(35C + 28C + 20C)/20 = 581
so... 83C = 581 × 20
so... C = 581 × 20 / 83
C = 7 × 20
= 140
so... value of C is 140..
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