A local florist charges $8 for a red rose and $10 for a white rose. He sold twice as many red roses as white roses for a total income of $8,554 for the day. How many roses did he sell all together?

The florist sold 329 white roses, and 658 red roses.

329 + 658 = 987 roses.

The florist sold a total of 987 roses.

You set up the equations first. R = red rose, w = white rose

r=2w

8r+10w=8,554

You substitute r with 2w in the second equation and begin to evaluate. You should get w=329. Since w=329, you substitute this into the first equation, thus r = 2 (329) = 658. You add both together to figure out the total amount sold, 658+329=987.