The ratio of r-32 to r-125 is 3:2
A ratio in math displays how many times one number is contained in another. Comparing two numbers by dividing them is how ratios work. Your formula would be A/B if you were contrasting one data point (A) with another data point (B). When both sides of a ratio are whole numbers and cannot be divided by a whole number, the ratio is in its simplest form.
Given,
Refrigerant r-32 and r-125 are the two main constituents of refrigerant r-410.
60 pounds of r-32 and 40 pounds of  r-125 make up to 100 pounds of r-410.
The ratio of r-32 to r-125 = 60/40 =3/2.
Hence, the required ratio of r-32 to r-125 is 3:2
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