Indicate if the pair of quantities are directly proportional or inversely proportional:

<The speed of a car and the time it takes to travel from Lourdes to Santa Tecla>.

Indicate if the pair of quantities are directly proportional or inversely proportional:

<The time of a vacuum cleaner is used and the amount of energy it uses>.

Calculate and round off into units if the result is not exact:

15% of 350 & 7% of 3640

A healt report indicates that 33.8 % of the population has had flu this year. What percentages of the population has not had flu this year?

A family buys a refrigerator that costs $640. They pay the 40% ins cash and the remainder in 6 instalments without any additional charges. How much is each instalments?

There are 30 students in a class, 8 of whom have signed up for athletics. What percentage of the class have signed up for athletics?

A train takes 9 hours to go from city A to city B at an average speed of 60 km/h. How long will another train to travel the same distance at an average speed of 190 km/h?

Last week an employee was paid $60 for 5 extra hours. How much will the employee be paid for 3 hours?

75 students at a school cafeteria have consumed 230 kilos of fish in two months.

How many kilos of fish will 150 students eat in one month? And in three months?