Question

A recipe for molding dough calls for flour and salt in a ratio of 3 to 2. If you use 4 cups of salt, how much flour should you use?

Answer 1

flour : salt = 3 : 2
so when we use 4 cups of salt then the amount of flour to be used (let) x
since the ratio must be equal therefore
x:4 = 3:2

which means
x/4 = 3/2
crossmultiplying them gives us
2x = 12
which means x = 6