Question

calcular el 30% del 20% del 60% de una cantidad cuyo 36% es equivalente al 50% del 72% de 2500 a)1500 b)450 c)900 d)1800 e)750

Answer 1

30%*20%*60%X=? ...(1)
36%X=50%*72%*2500 ...(2)
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de (2) resolvemos:
36%X=50%*72%*2500 
$\frac{36}{100} X=\frac{50}{100}*\frac{72}{100}*2500 \\X= \frac{50*72*2500*100}{100*100*36} \\X=2500$
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ahora calculamos en (1)
30%*20%*60%X=$\frac{30}{100}*\frac{20}{100}*\frac{60}{100}*2500= \frac{30*20*60*2500}{100*100*100}=90$

espero te sirva :)