There are 15 students in the third grade and twice that number in the fourth grade. There are 20 boys and 12 girls in the second grade. How many students are in grades 2 through 4 altogether?
Question
There are 15 students in the third grade and twice that number in the fourth grade. There are 20 boys and 12 girls in the second grade. How many students are in grades 2 through 4 altogether?
Solution
Step 1: Determine the number of students in the fourth grade. Since there are twice as many students in the fourth grade as in the third grade, and there are 15 students in the third grade, there are 2 * 15 = 30 students in the fourth grade.
Step 2: Determine the total number of students in the second grade. Since there are 20 boys and 12 girls in the second grade, there are 20 + 12 = 32 students in the second grade.
Step 3: Add the number of students in each grade to find the total number of students in grades 2 through 4. There are 15 students in the third grade, 30 students in the fourth grade, and 32 students in the second grade, so there are 15 + 30 + 32 = 77 students in grades 2 through 4 altogether.
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