Question

3) The difference between twice a number and half that number is 30. What is the number?

4) Lisa sold costume jewelry at a bazaar. The first hour she sold 2 bracelets and 3 rings for a total of $36.00. Later a customer bought 2 rings and paid $12.All bracelets were prices the same. All rings were prices the same. How much did a bracelet cost?

Answer 1

Bracelets are $9

Explanation:

3. 2x - .5x = 30

1.5x = 30

Divide each side by 1.5

x=20

4. b=bracelets, r=rings 2b + 3r = 36

2r = 12, r=6, therefore rings are $6

Put that 6 into the formula above

2b + 3*6 = 36

2b + 18 = 36

Subtract 18 from each side

2b = 18

Divide each side by 2

b = 9