How old am i if 400 reduced by 2 times my age is 244 now 12

Atypical mre contains 1,200 calories. if the average solider eats 3 mre per day and is deployed for 15 months how many calories will be consumed by a 44 member platoon of soldiers

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

Ineed to know the answer to this algebra question.