What is the value of s in the equation 3 r is equal to 10 plus 5 s , when r is equal to 10 ?

Substitute r = 10 into the equation: 3(10) = 10 + 5s, so 30 = 10 + 5s. Subtract 10 from both sides to get 20 = 5s, then divide by 5 to find s = 4. The correct choice is 4.

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