Question

question no. 7 with proper working

Answer 1

number = L.C.M ( 16 , 28 , 40 , 77) + 5
16 = 2 ^ 4
28 = 2 ² * 7
40 = 2³ * 5
77 = 11 * 7
∴lcm (16 , 28 , 40 , 77) = 2 ^ 4 *11 * 7 * 5 = 6160
therefore number = 6165