There is 4/5 lb of sand in the class science supplies. If one scoop of sand weighs 1/20 lb, how many scoops of sand can Maria get form the class supplies and still leave 1/2 in the supplies?

The correct answer is 6 scoops of sand.

Step-by-step explanation:

1. Let's check all the information provided for solving this question:

Sand in the science class supplies = 4/5 lb

Sand per scoop = 1/20 lb

Sand that would remain after Maria get sand from the supplies = 1/2 lb

2. For finding out the solution, we use this formula:

Sand taken by Maria in scoops = Sand in the supplies - Sand that would remain

Sand taken by Maria in scoops = 4/5 - 1/2

Sand taken by Maria in scoops = 8/10 - 5/10 (for using a common denominator)

Sand taken by Maria in scoops = 3/10 lb

Now, we know that Maria will take 3/10 lb of sand in scoops from the class supplies. Now, we can calculate how many scoops she can get.

Number of scoops = (3/10) / (1/20)

Number of scoops = (3/10) * (20/1)

Number of scoops = (3*20/10*1)

Number of scoops = (60/10) Simplifying

Number of scoops = 6

Maria can get 6 scoops of sand from the class supplies and still leave 1/2 lb in the supplies