There are x tons of sand in a construction site, 2.5 tons are used every day, and there are (X-2.5B) tons left after using it for b days.
A farm has two paddy fields, the first one is one square meter, and the average rice yield per square meter is m kilograms.
The second plot is b square meters, with an average yield of N kilograms of rice per mu.
AM stands for the number of the first batch of local rice.
BM stands for the second batch of locally grown rice.
AM+BN represents the rice yield of two plots.
Have you got the wrong question? It should be AM+BN, not AM+BM! ! !