Number of existing passengers in the car
Number of existing passengers on the bus-number of descending passengers+number of ascending passengers = number of existing passengers on the bus.
The total weight of two fruits
Total weight of two fruits-total weight of 25 boxes of apples = total weight of 32 boxes of pears or total weight of 25 boxes of apples+total weight of 32 boxes of pears = total weight of two fruits.
Number of stamps at home and abroad
Number of foreign stamps ×5-5= number of domestic stamps or (number of domestic stamps +5)÷5= number of foreign stamps.
Area of triangle
Area of triangle = base × height ÷2.