20x/3 + 15x/7 =5 what is x the variable

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be able to prepare using the sauce?

Adele is five years older than timothy. in three years, timothy will be 2/3 of adele’s age. what is adele‘s current age?