Answer:
21
Step-by-step explanation:
The largest prime number that is a factor of 35 is 7 and the smallest prime number that is a factor of 15 is 3 so:
7 x 3 = 21
the largest prime number of 35 is 7
35=5×7
the smallest prime number of 15 is 3
15=5×3
multiply 7×3=21
