How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid to obtain a mixture containing a 40% solution of acid?

Five people, each working 8 hours a day, can assemble 400 toys in a five day work week. what is the average number of toys assembled per hour Per person

How many solutions does the equation 6y - 3y - 7 = - 2 + 3 have? A. Two B. None C. Only one D. Infinitely many Also explain how you got the answer so i can learn more about it.

Subtract. 47.63 - 3.41 A. 13.53 B. 17.22 C. 44.22 D. 51.04

What does 28 tens equal to

Twelve Boy Scouts each need 9/12 of a yard of rope to practice tying knots. If their leader buys 14 yards of rope, how much rope will be left over?

How do you expand the expression 3 (x+11)

5 (2x + 6) = 8x + 48 simplify.

If 30+12x represents the area of a partitioned rectangle, what could be expressions for the side lengths? List at least 5 possibilities

Jay Low received scores of 87 and 98 on his first two exams of the grading period. At least what score must jay earn on the next exam for the test average to be at least a 93 for the grading period?

Keenan made a large batch of lemonade for his team. He poured 72 cups of water into a large cooler. Then he added 1 cup of lemonade concentrate for every 2 quarts of water and mixed all of the liquids together.