Question

90% of runners who started a marathon completed it. Of those, 30% are men. If 270 men completed the marathon, then how many total runners started the marathon?

A) 1200
B) 1000
C) 630
D) 900

Answer 1

B

1000*90%*30%=270.

Hope this can help.

Answer 2

Out of 100% ,90% completed the marathon

Of 90% , 30% are men that means 60% are women

If 30% are 270 men then 60% are 540 women ( if 30% represent 270 then 60% represent 540)(270 x 2)

And other 10% represent 90 runners ( If 30% represent 270 then 10% represent 90)(30/10)

Therefore total runners = 30%+60%+10%

                                       = 270+540+90

                                      = 900

That means answer D