Total amount of work ÷ work efficiency = working hours

Total workload ÷ working time = working efficiency

Speed × time = distance

Distance/speed = time

Distance/time = speed

Principal * interest rate = interest

Unit price * quantity = total price

Work efficiency * time = total workload.

Single output * quantity = total output

Number of copies * Number of copies = Total number Speed = Time * Distance

Principal * interest rate * time = interest

The main quantitative relationship in tree planting is: the number of intervals × the number of meters in each interval = a * * * * number of meters;

The main quantitative relationship of sawing wood is: times of sawing × time of sawing = time of sawing;

The quantitative relationship in the stair climbing problem is: the number of stairs ÷ the number of stairs between every two floors = the number of stairs.

The main relationship of the bell ringing problem is: the number of waiting times × the time of waiting once = the time of waiting once.

Survival rate = number of surviving trees/total number of trees

Qualified rate = qualified/total