Solving Systems of Equations in Word Problems - New SAT Math - No Calculator
Card 0 of 2
Gary is twice as old as his niece Candy. How old will Candy will be in five years when Gary is 
years old?
Gary is twice as old as his niece Candy. How old will Candy will be in five years when Gary is
Since Gary will be 37 in five years, he is 
years old now. He is twice as old as Cathy, so she is 
years old, and in five years, she will be 
years old.
Since Gary will be 37 in five years, he is
Compare your answer with the correct one above
Mark is three times as old as his son Brian. In ten years, Mark will be 
years old. In how many years will Mark be twice as old as Brian?
Mark is three times as old as his son Brian. In ten years, Mark will be
In ten years, Mark will be 
years old, so Mark is 
years old now, and Brian is one-third of this, or 
years old.
Let 
be the number of years in which Mark will be twice Brian's age. Then Brian will be 
, and Mark will be 
. Since Mark will be twice Brian's age, we can set up and solve the equation:
Mark will be twice Brian's age in 
years.
In ten years, Mark will be
Let
Mark will be twice Brian's age in
Compare your answer with the correct one above