Question

what is the value of s in the equation $3r = 10 + 5s$, when $r = 10$?
4 100
8 200

Explanation:

Step1: Substitute \( r = 10 \) into the equation

We have the equation \( 3r = 10 + 5s \). Substituting \( r = 10 \), we get \( 3\times10 = 10 + 5s \).

Step2: Simplify the left - hand side

Calculating \( 3\times10 \), we have \( 30 = 10 + 5s \).

Step3: Isolate the term with \( s \)

Subtract 10 from both sides of the equation: \( 30 - 10=10 + 5s-10 \), which simplifies to \( 20 = 5s \).

Step4: Solve for \( s \)

Divide both sides of the equation by 5: \( s=\frac{20}{5}=4 \).

Answer:

4