First, you would need to figure out how much a single flower would cost. To do this, you would divide $90 among the 10 flowers.
$90 ÷ 10 = $9
A single flower would cost $9.
Now, all you would have to do is multiply the cost per flower by the number of flowers.
$9 × 5 = $45
I would cost $45 for a bouquet of 5 flowers.
I hope this helps!