Question

Hello, My name is oumar and I'm getting ready for an shsat tomorrow I need help about learning how to do probability.

Answer 1

`\begin{gathered} A=red\text{ pencils = 6} \\ P(A)=(2)/(7) \\ x=\text{ }no\text{ red pencils} \\ \text{total penceils = A+x} \\ \text{Hence} \\ (2)/(7)=(6)/(6+x) \\ \text{Solving x} \\ (2)(6+x)=(7)(6) \\ 12+2x=42 \\ 2x=42-12 \\ 2x=30 \\ x=(30)/(2) \\ x=\text{ 15} \\ \text{There are 15 no red pencils in the box} \end{gathered}`