Question

1=15 2=30 4=60 6=90 8=120 11=150 12=165 15=

Answer 1

Hello,
we have that:
1 = 1×15 = 15 ;
2 = 2×15 = 30 ;
4 = 4×15 = 60
6=6×15=90;
8=8×15=120
11=(11×15)- 15 = 150
12 = (12×15)-15 = 165
hence 
15 = (15×15) - 15 =225-15= 210 

bye :-)

Answer 2

Hey!

1=15
2=30 [15×2]
4=50 [15×4]
6=90 [15×6]
8=120 [15×8
11=150 [(15×11)-15]
12=165[(15×12)-15]

Thus,

15=___[(15×15)-15]
15=210


Hope it helps...!!!