Question

(2*3*5+8*12*20+12*18*30)/(3*5*7+12*20*28+18*30*42)

Answer 1

(2*3*5+8*12*20+12*18*30)/(3*5*7+12*20*28+18*30*42)

=2*3*5*(1+4*4*4+6*6*6)/[(3*5*7)*(1+4*4*4+6*6*6)]

=(2*3*5)/(3*5*7)

=2/7