[Video] Q2: If 3r = 18, what is the value of 6r + 3 ?

Explanation for Question 2 From the Math (No Calc) Section on the Official Sat Practice Test 3

Now number two gives us the expression. Three R is equal to 18, 2 and they want us to tell them the value of six R plus three. 3 And so what might be uncomfortable about this question is you may be more 4 used to seeing them ask you for one specific variable here rather than for 5 an entire expression. And so the way to go about this question is to 6 solve for R simply and then plug R into this expression that 7 we actually want to solve for. Right? And so three R is equal to 8 18. I can divide both sides by three to solve for are these used 9 will cancel and I'm left with R is equal to six. 10 So now I'll plug that in here. Six times six instead of six times 11 R plus three, 12 right? Six times six is 12, 12 plus three is 15. 13 And so, or six times six is 36, 14 right? So we have 36 plus 15 three, which is 39. And so our best answer then is D.