if 5 times a number is increase by 5, the result is 30.find the number. A)30 B)7 C)5 D)20
5x+5=30
5n + 5 = 30
5n = 35
n = 35/5
n = ?
To solve this problem, we need to set up an equation and solve for the unknown number.
Let's call the unknown number "x". According to the problem, if we multiply this number by 5 and then add 5, the result is 30. We can write this as an equation:
5x + 5 = 30
To solve for x, we can isolate the variable. First, we can subtract 5 from both sides of the equation:
5x + 5 - 5 = 30 - 5
5x = 25
Next, we can divide both sides of the equation by 5 to solve for x:
5x/5 = 25/5
x = 5
Therefore, the number is 5.
So, the correct answer is C) 5.