Question 402069
{{{x + 20*(5/8) + 65*(6/13) = (x + 20 + 65)*0.60}}}
==> x + 12.5 + 30 = 0.60x + 12 + 39
==> x + 42.5 = 0.60x + 51
0.40x  = 8.5
x = 21.25 kg of alloy X.