Word problems

What is the total interest made after 4 years on a simple interest loan that accumulates 13% each year and has original amount of $1350? I=A×r×t

$702

Barry invests $9000 in corporate bonds at 8% annual interest, compounded quarterly. At the end of the year, how much interest has his investment earned? A = P (1+ r/n)^nt

$741.98

Which 3 numbers have the same answer whether they're added or multiplied together?

1, 2, 3

There are 24 students in a seventh grade class. They decided to plant birches and roses at the school's backyard. While each girl planted 3 roses, every three boys planted 1 birch. By the end of the day they planted 24 plants. How many birches and roses were planted?

18 roses and 6 birches.

A farming field can be ploughed by 6 tractors in 4 days. When 6 tractors work together, each of them ploughs 120 hectares a day. If two of the tractors were moved to another field, then the remaining 4 tractors could plough the same field in 5 days. How many hectares a day would one tractor plough then?

Each of the four tractors would plough 144 hectares a day

A train covered half of the distance between stations A and B at the speed of 48 km/hr, but then it had to stop for 15 min. To make up for the delay, it increased its speed by 5/3​ m/sec and it arrived to station B on time. Find the distance between the two stations and the speed of the train after the stop.

The new speed is 54 km/hr. and the distance is 216 km.

Money is deposited in a bank account at 7% interest per year, compounded bimonthly. If no money is deposited into or withdrawn from the account, then how long will it take for the money to double? - 9 years 6 months - 9 years 10 months - 10 years 0 months - 10 years 2 months - 9 years 8 months

10 years 0 months

A salesman sold twice as much pears in the afternoon than in the morning. If he sold 360 kilograms of pears that day, how many kilograms did he sell in the morning and how many in the afternoon?

Morning = 120 kg Afternoon = 240 kg

To deliver an order on time, a company has to make 25 parts a day. After making 25 parts per day for 3 days, the company started to produce 5 more parts per day, and by the last day of work 100 more parts than planned were produced. Find how many parts the company made and how many days this took.

The company worked 23 days and it made 675 pieces.

The first year, two cows produced 8100 litres of milk. The second year their production increased by 15% and 10% respectively, and the total amount of milk increased to 9100 litres a year. How many liters were milked from each cow each year?

The cows produced 3800 and 4300 liters of milk the first year, and 4370 and 4730 liters of milk the second year, respectively.

One side of a rectangle is 3 cm shorter than the other side. If we increase the length of each side by 1 cm, then the area of the rectangle will increase by 18 cm^2. Find the lengths of all sides.

The sides of the rectangle are 10 cm and 7 cm long.

The distance between two towns is 380 km. At the same moment, a passenger car and a truck start moving towards each other from different towns. They meet 4 hours later. If the car drives 5 km/hr faster than the truck, what are their speeds?

The truck's speed is 45 km/hr, and the car's speed is 50 km/hr.