Answer:
3 : 2
Explanation:
Ratio defined as the comparison of two sizes or class.
i.e a to b = a:b
As per the statement:
Robert planted 24 daffodil bulbs and 36 tulip bulbs in his garden last winter.
⇒Number of daffodil bulbs = 24 and Number of tulip bulb = 36.
To find the the ratio of tulips to daffodils in Robert's garden.

Substitute given values we have;

Divide numerator and denominator by 12 we have;

By definition of ratio, we have
3 : 2
Therefore, the ratio of tulips to daffodils in Robert's garden is, 3: 2