Justin took photographs during a trip to the mountains. He used one roll of

color film and one roll of black-and-white film. He took 1/3 of the pictures in
color during a picnic with his family. If he took 36 pictures in all, how many
color pictures did he take during the picnic?

36 / 1.3 =27.69(round up) 28 color pictures

1/3 * 36 = 12.

To find out how many color pictures Justin took during the picnic, we can follow these steps:

Step 1: Determine the total number of pictures Justin took
We are given that Justin took a total of 36 pictures.

Step 2: Determine the number of black-and-white pictures Justin took.
We are told that Justin used one roll of black-and-white film, but we don't know how many pictures were on the roll. Therefore, we cannot determine the exact number of black-and-white pictures Justin took.

Step 3: Determine the number of pictures Justin took in color during the picnic.
We are told that Justin took 1/3 of the pictures in color during the picnic. Since we know the total number of pictures Justin took, we can calculate the number of color pictures he took during the picnic.

To find the number of color pictures during the picnic, we can use the following formula:
Number of color pictures = (Total number of pictures) × (Fraction of pictures in color during the picnic)
Number of color pictures = 36 × (1/3)
Number of color pictures = 12

Therefore, Justin took 12 color pictures during the picnic.