If y=-16 when x=4, find x when y=20.

x = ?

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Pls! does anybody know a shortcut for answering these types of questions in the future?

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?