Benjamin had 1/2 lb of modeling clay. He used 1/5 lb on Monday and another 1/4 lb on Tuesday. How many pounds of clay does Benjamin have left after Tuesday? Enter your answer in simplest fractional form in the box.

Answer: 1/20 pounds

Step-by-step explanation:

Hi, to answer this question we have to analyze the information given:

Modeling clay available: 1/2lb Modeling clay used: 1/5 lb on Tuesday and 1/4 on Tuesday.

So, we have to subtract the amount of clay used (1/5 + 1/4) to the amount of clay available (1/2).

Mathematically speaking:

1/2 lb - (1/5 lb + 1/4 lb) =

1/2 lb - 9/20 lb = 1/20 lb = 1/20 pounds

1/2 = 10/20. 1/5 = 4/20. 1/4 = 5/20.

10/20 - 4/20 = 6/20.

6/20 - 5/20 = 1/20 lbs