Yup..it comes up all the time..I was told to know Mile to Km or vice versa. or Know the Temp stuff really well( F to C or C to F and C to Kelvin). Can someone Post them up the formula for all of them?
PS. you need to know Kg to gram, foot to miles . Cant think of anything else for now.but if I rmr somthing I will post them up.