If the subnet mask for Class A address is 255.255.240.0, how many bits are used for subnetting?

Question: 1 Question: 2 Question: 3 Question: 4 Question: 5 Question: 6 Question: 7 Question: 8 Question: 9 Question: 10 Question: 11 Question: 12 Question: 13 Question: 14 Question: 15 Question: 16 Question: 17 Question: 18 Question: 19 Question: 20 Question: 21 Question: 22 Question: 23 Question: 24 Question: 25 Question: 26 Question: 27 Question: 28 Question: 29 Question: 30 Question: 31 Question: 32 Question: 33 Question: 34 Question: 35 Question: 36 Question: 37 Question: 38 Question: 39 Question: 40 Question: 41 Question: 42 Question: 43 Question: 44 Question: 45 Question: 46 Question: 47 Question: 48 Question: 49 Question: 50 Question: 51 Question: 52 Question: 53 Question: 54 Question: 55 Question: 56 Question: 57 Question: 58 Question: 59 Question: 60 Question: 61 Question: 62 Question: 63 Question: 64 Question: 65 Question: 66 Question: 67 Question: 68 Question: 69 Question: 70 Question: 71 Question: 72 Question: 73 Question: 74 Question: 75 Question: 76 Question: 77 Question: 78 Question: 79 Question: 80 Question: 81 Question: 82 Question: 83 Question: 84 Question: 85 Question: 86 Question: 87 Question: 88 Question: 89 Question: 90 Question: 91 Question: 92 Question: 93 Question: 94 Question: 95 Question: 96 Question: 97 Question: 98 Question: 99 Question: 100 Question: 101 Question: 102 Question: 103 Question: 104 Question: 105 Question: 106 Question: 107 Question: 108 Question: 109 Question: 110