If you are given that you can use only four different weights to measure all whole number weights lying between 1 and 80 including both then what would be those weights?

Answer 1

7 8 9 52 ************* The above answer (7, 8, 9, 52) is wrong because you can not measure for example 80 kg (since 7+8+9+52=76), nor 79 kg, 78 kg and so on. Actually, using a two disc balance and four weights (1, 3, 9, and 27) , you can ONLY measure from 1 to 40 kg (increase by 1) Using a two disc balance and FIVE weights (1, 3, 9, 27 and 81) , you can measure up to 121 kg. Ifyou want to measure up to 80 kg with four weight, you should either start from a number higher than 1, or increase the numbers by 2.