Must produced 100 kg of low fat cream(18% fat) from double fat cream (48% fat) & milk (3.5% fat). H?

18% = 0.18
48% = 0.48
3.5% = 0.035

100kg of 18% cream = 18kg fat

18 = 0.48x + 0.035(100 - x) Now it's simple arithmetic.

18 = 0.48x + 3.5 - 0.035x

14.5 = 0.445x

x = 32.584 kg of 48%

100 - x = 67.416 kg of 3.5%