90% of runners completed a marathon.30% of them were men.If 270 men completed the marathon,how many total runners started the marathon?
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Let the total number of runners be x
90% of x completed the race
90%of x=90x/100
30% of those who completed the race were men
30% of 90x/100=men
no of men who completed the race =270
(30/100)*90x/100=270
2700x/10000=270
27x/100=270
x=270*100/27
x=1000
Total runners started the marathon =1000
runners completed the race=(90/100)*1000
=900
no of men =(30/100)*900=270
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