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Bonjour, Voici Mon Exercice, C'est un exercice de maths en anglais :

How old is Mike ?

Mike Is x years old. His mother is 4 times his age. His sister is 6 years younger than him.

1) Write two expressions to describe the age of Mike's mother and of his sister.

2) The sum of all three ages is 48. Write an equation to show this.

3) a. How old is Mike ?
b. How old was Mike's mother when Mike was born ?

Merci de votre aide.

Sagot :

Swnn
1) Mike’s mother age: 4*x = 4x
Mike’s sister age: x-6

2) x is the age of Mike, so:
x + 4x + x-6 = 48

3) a. solve the equation to find mike’s age:
x+4x+x-6 = 48
6x-6 = 48
6x=48+6
6x = 54
x = 54/6
x = 9

Mike is 9 years old.

b. When Mike was born, his mother was 27
(because: now she is 4*9 = 36 years old, 9 years ago, she had 36-9 = 27 years old).

Wisedevil
Bonjour, 

1.
Mike is x years old 
His mother is 4 times his age ->  4x 
His sister is 6 years younger than him -> x - 6 

2.  x +  4x + x - 6 = 48 

3. a. x + 4x + x - 6 = 48 
    6x - 6 = 48 
    6x = 48 + 6 
    6x = 54
     x = 54/6
     x = 9
 
Mike is 9 years.
 
His mothers : 9 × 4 = 36
His sister : 9 - 6 = 3

Verification : 9 + 36 + 3 = 48 

b. 36 - 9 = 27
When Mike was born, his mother was 27.

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