Answer:
a. 3
Step-by-step explanation:
The number of flowers should be divisible by the number of bouquets.
Since

there should be 5 bouquets, and each bouquet has 5 roses, 9 tulips and 3 snapdragons.
so the answer is
a. 3
The answer is B. Yes; 4
Arithmetic sequence is the type of sequence of numbers which difference between each number will always remain constant
in the sequence above we could see the difference between one number with another is exactly 4:
15 + 4 = 19
19 + 4 = 23
23 + 4 = 27
2 goes into 400, that is

,
However, 2 goes into 400,
200 times.
2+1=3
15/3=5
split the 3 5's in ratio 2:1 and you get 10:5