Explanation:
let's assume there are 100 flowers in total, because that's an easy number to work with. we know that 3/4 is 75%. if 75% of 100 flowers are tulips, that means there are 75 tulips. now, we know that 2/3 is 66.666%. since that's not an easy number to work with, we'll just use the fraction. since 75 is divisible by 3, we can take 1/3 of 75 and multiply it by 2 for the final answer. 75/3=25, and 25×2=50, so there are 50 yellow tulips.