Question

60% of the 50 students in Jessie’s gym class are 12 years old. How many students in Jessie’s class are 12 years old?

A tape diagram. There are 60 students out of 100 that are 12 years old. There are question mark students out of 50 that are 12 years old.

What steps should you use to find 60% of 50? Check all that apply.
100 ÷ 20 = 50
100 ÷ 2 = 50
60 ÷ 2 = the number of students who are 12 years old.
60 ÷ 20 = 3 students
60 ÷ 2 = 30 students
30 of the 50 students are 12 years old.

Answer 1

Answer:

None

Step-by-step explanation:

For me, the easier way to see that the answer is 30 students (12 years and older) is to convert the 60% to a decimal, 0.60, and multiply by the total number of students:

(0.06)*(50) = 30 students are 12 and older.

None of the listed answers make sense to me.  Yes, a couple have the correct answer, but their derivation is incorrect.

100 ÷ 20 = 50   [who, what??]

100 ÷ 2 = 50       [who, what, why??]

60 ÷ 2 = the number of students who are 12 years old.  [Correct, but where did the 2 come from?]

60 ÷ 20 = 3 students  [gimmee a break]

30 of the 50 students are 12 years old. [Yes, but what is the calculation that led to this conclusion?]