Respuesta :

You could set up a proportion to figure out the anwer. 15 hurdles/60%=X hurdles/100%. Cross multiply, 1500=60x. Divide by 60, 25=X=total amount of hurdles. Hope this helps!
40/100*15

cancel 100 and 15

40/20*3

120/20

6 hurdles is 40%

6+15=21 hurdles 

there are 21 hurdles.