Which is the largest multiple of five that lies in the solution set for 19

15

Step-by-step explanation:

Multiples of 5 are:

5 10 15 20 25 30 ...

Now we are having solution set 19

Multiples of five below 19 are:

5 10 15

Largest of 5 10 15 = 15

So the largest multiple of five that lies in the solution set for 19 is 15