1. (x – 5) + 8 = 100
2. H + 3.5
3. K × 25 = 2,550
4. 8m
Let x = be the 3rd number
Solution:
[tex] \frac{3m + 4m + x}{3} = 5m[/tex]
[tex] \frac{7m + x}{3} = 5m[/tex]
7m + x = 3 × 5m
7m + x = 15m
x = 15m -7m
x = 8m
5. 2(x + 2) = 36
6. P + 5 = 17
7.
Let x = be the costumer last week.
x – 20 = 144
8. 2x – 7 = 24
9. x = 9
Solution:
3x + 15 = 42
3x = 42 – 15
3x = 27
[tex] \frac{3x}{3} = \frac{27}{3} [/tex]
[tex]x = 9[/tex]
10 . 2x + 6 = 66
PS. To all the numbers without specific given for the representation of a number, i represent the number as X.
