Some coal has been transported by Party A alone for six times and Party B alone for five times. Now Party A has transported three times and Party B has transported two times, with a total of 18 tons. How many tons in total?

Some coal has been transported by Party A alone for six times and Party B alone for five times. Now Party A has transported three times and Party B has transported two times, with a total of 18 tons. How many tons in total?

3 / 6 = 1 / 2 of the total amount transported by a 3 times
B transported two fifths of the total twice
Therefore, 1 / 2 + 2 / 5 of the total amount transported by Party A 3 times and Party B 2 times is 9 / 10
That is to say, 18 tons corresponds to 9 / 10 of the total tons
So: total tonnage = 18 ÷ (9 / 10) = 20 tons