Register
David is twice as old as Sara, and Jessica is three times as old as Sara. If their ages add up to 30, how old is David? x = Sara's age 2x = David's age 3x = Jessica's age
162k views
2 votes
David is twice as old as Sara, and Jessica is three times as old as Sara. If their ages add up to 30, how old is David?

x = Sara's age
2x = David's age
3x = Jessica's age

User Babu Sekaran
by
9.2k points

1 Answer

4 votes
x + 2x + 3x = 30
combine like terms

6x = 30
divide both sides by 6 to isolate the variable

x = 5

Sara is 5
David is 10
Jessica is 15
User Traggatmot
by
7.0k points
← Prev Question Next Question →

Related questions

Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Other Questions

What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
A dealer sells a certain type of chair and a table for $40. He also sells the same sort of table and a desk for $83 or a chair and a desk for $77. Find the price of a chair, table, and of a desk.
The cost of 5 similar digital cameras and 3 similar video cameras is 3213. Each video camera costs 4 times as much as each digital camera. John buys a digital camera and a video camera. How much does he
Link Copied!