Mike was in charge of a special sports day at the Community Center. A company donated 50 boxes of ice cream bars, with 12 bars in each box. If 520 people had ice cream bars, how many bars were left?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

The value of cos 30° is the same as which of the following?