Unit price * quantity = total price

Work efficiency * time = total workload.

Single output * quantity = total output

Number of copies * number of copies = total number of copies

Speed = time * distance

Principal * interest rate * time = interest

Tree planting problem: the number of intervals × the number of meters in each interval = the number of meters in a * *

Stair climbing problem: number of stairs ÷ number of stairs between every two floors = number of stairs.

Survival rate = survival number/total number of plants

Qualified rate = qualified/total

Profit rate = profit/purchase price

Match in pairs, number of times = number of teams * (number of teams-1) divided by 2.

Time = distance/speed