Question

You are a school photographer taking individual and class pictures for 2 classes of 21 students each. On average, each individual picture takes 3 minutes and a class picture takes 10 minutes. About how long should it take you to get all of the pictures?

Answer 1

146 minutes

Explanation:

2 class has 21 students each

2 class has students = 21+21=42

It takes time to click picture of 1 student = 3 minutes

It takes time to click picture of 42 student =
`3 * 42` minutes

=
`126` minutes

It takes time to click picture of 1 class = 10 minutes

It takes time to click picture of 2 class = 20 minutes

So, total time = 126 minutes + 20 minutes = 146 minutes

Thus it will take 146 minutes to get all of the pictures

Answer 2

2 x 10 (classes x mins to take) = 20mins

21 x 2 = 42 individual students (students per class x number of classes)
42 x 3 (students x mins to take) = 126mins

20 + 126 = 146 minutes (2 hours and 26 minutes)