9
QuizMultiple Choice
Unit Test
Question 9 of 15 • Math 7 B (M12 25/26 S2)
Sadie is 3 years older than Kareem, and Kareem is twice as old as Nadra. The sum of their ages is 33.A student used the steps below to find each person’s age.Step 1Write an equation, letting x represent Kareem’s age:Step 2Solve the equation:Step 3Sadie is , Kareem is , and Nadra is .Which corrects the student’s first error?
Answer
A
In Step 1, the student should have used to represent Nadra’s age, and written the equation .
B
In Step 2, the student should have added 3 on both sides of the equation to find a solution of .
C
In Step 3, the solution represents Sadie’s age. Therefore, Sadie is , Kareem is , and Nadra is .
D
In Step 3, Nadra’s age is the difference between 33 and Sadie’s and Kareem’s ages, so Nadra is 15.