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Question

Brad wants to buy flowers for his friend with $21. The daises are $2 each and the roses are $3 each. He buys 3 more daisies than roses. How much did the roses cost?

Answer 1

Let's use the variable, r , to represent the number of roses he bought.

Since he bought 3 more daisies than roses, we can write the following expression for the number of daisies he bought: 3 + r

Now we can use the cost information to find the number of roses:

Amount spent on roses + amount spent on daises = $21

$3 • r + $2 • ( 3 + r) = $21

Now use the distributive property, combine like terms, and use inverse operations to solve for r:

3r + 6 + 2r =21

5r + 6 =21

5r + 6 - 6 = 21 - 6

5r = 15

5r/5 = 15/5

r = 3

He bought 3 roses.

Daises will be 3 more than the number of roses OR 3 + 3 =6 daisies

The roses cost $3 • 3 roses or $9 total spent on roses.