Four and sixteen = 20.
Sweet sixteen is not an expression that translates into French. It is an English idiom.
It could be x/16 or 16/x. The x could be substituted by any other letter, for example, y/16 or 16/y.
33
The expression is: 2x-16
It is 4.16
54 + 16
24+16=40
Sixteen divided by two times itself three times
12+(16/x)
192/16 = 12
16 + 3x