It is normal to take the first weight equal to 1 kg.
So we can measure up to 1 kg.
Now the logic thing would be to take the second weight equal to 2 kg.
But we can skip the 2 kg and take the second weight equal to 3 kg, because by puting the first weight (=1 kg) on the other side of the balance, we can measure 2 kg.
By puting the first and the second weight together, we can measure up to 4 kg as well
Now the logic thing would be to take the third weight equal to 5 kg.
But we can skip the 5 kg and take the third weight equal to 9 kg, because by puting the first weight and second weight together (=4 kg) on the other side of the balance, we can measure 5 kg.
By puting the first and the second and the third weight together, we can measure up to 13 kg as well.
Using the same logic, the fourth weight must be equal to 27 kg.
In case we had only a two weight box, the weights should be 10 ad 30 kg, and we could measure 10, 20 (=30-10), 30 and 40 kg.
thanks for the explanation...
i happened to find another answer to this question.
i divide the 40kg weight into 4 parts of weights 2,6,7,25kgs respectively.
I'll be able to make numbers from 1 to 40 using these 4 numbers using + and - operations
7-6 =1
7+2-6 =3
6-2 =4
7-2 =5
6+2 =8
7+2 =9
25-7-6-2 =10
7+6-2 =11
25-7-6 =12
7+6 =13
25-7-6+2 =14
7+6+2 =15
25-7-2 =16
25-6-2 =17
25-7 =18
25-6 =19
25+2-7 =20
since i have proved it to be working for 1 to 20 it will also work for 21 to 40.
1
You're a total life noob, it depends on the density and molecular weight of the matererial. Which falls faster? a) 1kg box of feathers; or b) 1kg box of lead.
There would be 400 candles in the 1KG box
1Kg is the equivalent to 1000g so if Harry eats 400g there will be 600g left and if his girlfriend then eats 165g there will only be 435g left!
It cannot be done.
Box of apples = 9 kg + Half the weight of a box of applesThis can be written as...Box of apples = Half the weight of a box of apples + Half the weight of a box of applesThis means that 9 kg = Half the weight of a box of apples, so...9 x 2 = 18 kg
Have a look on the cereal box, the weight is always shown.
-- A 2-lb cheese wrapped in heavy foil and sealed in a box. -- A rock that weighs 2.2 pounds.
1,000 grams = 1 kilogram Therefore four boxes because 1,000 grams (1 kilogram) divided by 250 grams (weight of one box) equals four boxes.
51 g
A square box
find the net weight of box, compare it to weight of jar.