Next number in series

Question

Find next number in series?

15,10,5,150,16,12,4,192,20,15,5,....?

Answer 1

It is a set of four numbers a, b, c, d

where a and b are given we need to check pattern for c and d.

for c it is a - b.

and for d it is a * b.

so talking the last pattern

a = 20, b = 15,

c = 20 - 15

d = 20 * 15.

So d = 300.

Answer 2

answer is:  300

                 (15*10)                 (16*12)                 (20*15)

                    ⇓                          ⇓                          ⇓

15 , 10 , 5 , 150 , 16 , 12 , 4 , 192 , 20 , 15 , 5 ,   300

             ⇑                          ⇑                         ⇑   

          (15-10)                (16-12)                (20-15)

Answer 3

15,10,5,150,16,12,4,192,20,15,5

first two numbers difference is 15-10=5 is third number

15*10=150 is the fourth number

16-12=4 is seventh number

16*12=192 is Eigth number

20-15=5  is Eleventh number

20*15=300 is Twelth number

so answer is 300