Question

How many parts by weight of 40% cream and 3% milk must be mixed to make milk testing 5% fat?

(a) 2 and 35

(b) 4 and 45

(c) 5 and 10

(d) 6 and 12

I got this question in an interview for job.

I'd like to ask this question from Standardization topic in chapter Building Blocks of Dairy Processing of Dairy Engineering

Answer 1

The correct answer is (a) 2 and 35

For explanation I would say: 2.0 parts of 40% cream when mixed with 35 parts of 3.0% milk will give 37 parts of 5% milk. Calculated using the Pearson square method.