Réponse :
Bonjour,
1)
The product of 5 and a number is 30.
5 * x = 30
x = 30 / 5
x = 6
2)
The sum of 43 and a number is 61
43 + x = 61
x = 61 - 43
x = 18
3)
Two less than three times a number is 28.
( 3 * x ) - 2 = 28
( 3 * x) = 28 + 2
3 x = 30
x = 30 / 3
x = 10
4)
Ten times a number, increased by 5.24 equals 65.24
( 10 * x ) + 5,24 = 65,24
10 x = 65,24 -5,24
10 x = 60
x = 60 / 10
x = 6
5)
The sum of 10 and the product of 4 and a number is 22
10 + ( 4 * x ) = 22
4 x = 22 - 10
4 x = 12
x = 12 / 4
x = 3
Explications étape par étape
x ( correspond a ce que l'on cherche, l'inconnu )
* ( pour multiplier )
