How many numbers up to 800 are divisible by both 3 and 5?
The number that is divisible by both '3' and '5' will also be divisible by '15' 
Hence, there are '53' numbers till '800' which are divisible by both '3' and '5'.
72, 36, 54, 135, 470.5, 2126.25
91 96 105 121 143 176
1024, 1056, 1096, 1144, 1196, 1260
17, 42, 58, 66, 71, 72
48, 112, 144, 192, 310, 732
640 1920 240 720 92 270
12, 220, 322, 376, 402, 415
96, 120, 180, 315, 472.5, 1417.5
81, 154, 124, 197, 167, 235
26, 38, 60, 110, 206, 398
