Question

An onion merchant sells the onions
with a maximum weight of 13kg
What is the minimum number of
weights, he should have in order to
weight any amount in one go​

Answer 1

Given :  An onion merchant sells the onions with a maximum weight of 13kg

To Find : What is the minimum number of weights, he should have in order to weight any amount in one go​

Solution:

1kg  3kg  9 kg

1

3 - 1 = 2

3

3 + 1 = 4

9  - 1 - 3 = 5

9 - 3 = 6

9 + 1 - 3 = 7

9 -  1= 8

9  

9 + 1 =10

9 +  3 - 1 = 11

9 + 3 = 12

9 + 3 + 1 = 13

Three weights   are enough

1 , 3 & 9 kg

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Answer 2

12344556667 io 90000009 ou 76554eq112 we 34 tu