# OEF proportionality --- Introduction ---

This module actually contains 11 exercises on proportionality.

### CD Rom

I have bought a CD rom driver. I have paid dollars with CD roms which cost dollars each. What is the price of the CD rom driver?

### Density

The population density of a country is inhabitants/km2. Its population is millions. What is its area (in thousands of km2)?

### Weights

A truck is times heavier than a car, while the truck is times lighter than a tank. Knowing that the truck weighs tons, compute the weights of a car and of a tank (in tons).

### Solving Percents using Proportions I

is percent of what number (to the nearest hundredth)?

### Solving Percents using Proportions II

What is percent of (to the nearest hundredth)?

### Solving Percents using Proportions III

is what percent of (to the nearest hundredth)?

Solve for x:

/x = /

### Solving proportions (level 2)

Solve the following proportion.

(enter two solutions)

(x + 1)/x = /(x + )

Solve for x:

/ = x/

Solve for x:

/ = /x

### Solving proportions (level 1d)

Solve for x: x/ = /
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Description: collection of exercises on proportionality. interactive exercises, online calculators and plotters, mathematical recreation and games

Keywords: interactive mathematics, interactive math, server side interactivity, algebra, proportionality, division, multiplication, percent