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If a:b = 3:4 ,b:c = 5:7 and the average of a, b, c is 21,what are the values of a, b, c |
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Answer» Step-by-step EXPLANATION: a:b3:4=15:20 B:c=5:7=20:28 a:b:c=15:20:28 a+b+c/3=21 a+b+c=63 15x+20x+28x=63 63x=63 x=1 then a=15,b=20,c=28 |
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