### Common Algebraic Expressions

The** double ** of a number:

The** triple** of a number:

The **quadruple** of a number:

**Half** of a number:

A** third** of a number:

A** quarter** of a number:

A number is** proportional** to

A number to the** square**:

A number to the** cube**:

Two** consecutive numbers**: and .

**Two consecutive even numbers**: and .

Two** consecutive odd numbers**: and .

**Break** ** in two parts**: and .

The** sum** of the two numbers will be .

The** difference** between the two numbers will be .

The** product** of the two numbers will be .

The** quotient** of the two numbers will be .

### Age Word Problems

Let the number of years =

After 10 years.

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Q. Today, John is three-quarters the age of his father and the difference in age is 15 years. Four years ago, the age of the father was twice the age of John. Find the age of the father and son 4 years ago.

John | Father of John | |
---|---|---|

Four years ago | ||

Today |

Age of John: .

Age or father: .

### Work Word Problems

Q. Working together, it takes two workers 14 hours to complete a task. How long does it take to do the same task separately if one worker is twice as fast as the other?

Fast | Slow | |
---|---|---|

Time | ||

Hours |

For the slow worker=

### Number Word Problems

Q. If the double of a number is subtracted by its half and the result is 54. What is the number?

Q. There is a two-digit number and the digits that form it are consecutively ordered. The greater digit is in the first figure that forms the number (to the left) and the smaller digit is the second figure. The number equals six times the sum of its figures. What is the number?

Units (second figure)

Tens(first figure)

If there is a two-digit number, for example, , it can be broken down, as follows: .

The two-digit number is .

As this number is six times greater than the sum of its figures: , then:

Units

Tens

Number

### Geometric Word Problems

Q. Find the value of the three angles in a triangle knowing that Angle B is greater than Angle C and A is greater than B.

The three angles measure .

Q. The base of a rectangle is twice its height. What are its dimensions if the perimeter is 30 cm?

Height

Base

Height

Base

### Mixture Word Problems

Q. A trader has two types of coffee, the first is dollars/kg, and the second, dollars/kg.

How many kilograms of each type of coffee must be mixed together to get kilograms of a mixture that would cost dollars/kg?

1st Type | 2nd Type | Total | |
---|---|---|---|

Number of kg | |||

Value |

**The mix is 30 kilograms of the 1st type and 30 of the 2nd type**

Q. There are two different types of silver and each type is divided into portions of one gram. The first type is purity and the other of purity. What is the weight of a bar that is formed by the contents of both types to obtain grams of silver at purity?

1st Type | 2nd Type | Total | |
---|---|---|---|

No. of g | |||

Silver |

1st type grams

2nd type grams

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