Two students flip coins and record the number of heads. They are supposed to flip 200 coins. The first student flips 200 coins, but the second student flips 100 coins and then doubles the result

Diego began his quest in the kitchen where two peanuts dropped on the floor.  he then went into the living room and left 1/6 of his remaining peanuts on the sofa.  He then walked down the hallway and ate three, but then dropped 1/7 of his remaining peanuts in the hallway.  Diego went into his room and began to jump on the bed, and 1/2 of the remaining peanuts fell out of his pockets.  Then he went into Uncle Robert’s room and gave him 1/3 of the remaining peanuts.  He then sees he has very little left so he eats six.  By the time I catch up to him and sees me, he drops four and eats the last two.    How many peanuts did Diego start off with?  Show your work.

We started with 50 snack bags. The kids that left early all took three bags. How many bags are left?(Let the number of kids be the unknown).

Mr. Powers gave a coin to each of the 25 children who came to his door for a treat last Halloween. If the coins were nickles and dimes and he gave away a total of $1.45, how many received dimes and how many nickels?