The sample space of the problem includes all the roses and hibiscus in a variety of colors. The sample space is equal to 315 flowers. There are 20 pink roses in the table so the probability of taking a pink rose out of the set is 20/315 or equal to 0.063
The ratio is 2 1/4:1/2, and for everything you do to one side, you do to the other, so, 2 1/4* 1.77777778=4, so 1/2*1.77777778=0.88888889
The quotient is 615.
I got it by using my calculator.
You could do the same thing with your calculator,
or even with a pencil and paper.