The container is filled with M&Ms, 1/3 of the M&Ms of the container were distributed equally into three bowls.
To determine the fraction of M&Ns that was poured into each bowl, you have to divide 1/3 by 3

To divide a fraction, you have to invert the divisor, to determine its reciprocal fraction, and then multiply the dividend by the reciprocal fraction.
To invert 3, first, you have to express it as a fraction, to do so you have to divide it by 1 since it is a whole number:

Then swap the places of the numerator and denominator to determine the reciprocal fraction

Next, multiply the dividend of the division by the reciprocal fraction:

So if 1/3 M&Ms was divided equally into 3 bowls, each bowl received 1/9 M&Ms
If each bowl has 6 pounds of M&Ms, and we know that this represents 1/9 of the total amount of M&Ms on the container, to determine how many M&Ms there are in the container you can use cross multiplication.
If in each bowl there is 1/9 of the amount of the container, then the total amount of the container can be considered as "1 whole"
1/9 represents 6 pounds in one bowl.
1 whole represents x pounds in the container.
Both relationships have to be at the same ratio so that:

"1/9" is the divisor of the first rate, so you have to invert the fraction to determine its reciprocal fraction and multiply the dividend "6" by the reciprocal fraction:

Now multiply 6 by 9

And we get that there are 54 pounds of M&Ms in the container