Explanation for Question 5 From the Math (No Calc) Section on the Official Sat Practice Test 9
Question five, we have the expression C is equal to 75 H plus 125. 2 The equation above gives the amount C in dollars and electrician charges 3 for a job that takes H hours Ms. 4 Sanchez and Mr. Roland, each hired this electrician. 5 The electrician worked two hours longer on Ms. Sanchez, 6 Ms. Sanchez's job, then on Mr. Ronald's job. 7 How much more did the electricity electrician charge Ms. Sanchez than Mr. 8 Roland? Okay. 9 So this is a word problem. 10 And the best strategy that I would recommend for this one is trying to 11 convert the words that were given into numbers and expressions that we can plug 12 in and solve for. So we have this equation 13 right here, and this is essentially modeling out the amount 14 that the electrician charges his clients. 15 So we have the information that Ms. 16 Sanchez's job took two hours more than Mr. 17 Ronald jobs. So let's call the number of hours for Mr. 18 Ronald. So number of hours for our, 19 we're going to say, that's Ronald, you're going to be equal to ax and 20 number of hours for Ms. 21 Sanchez, let's use us is going to be equal to X plus two 22 because electrician worked two hours longer on Ms. 23 Sanchez's job than Mr. Rowland's. How much more did the electrician charge Ms. 24 Sanchez then Mr. Roland. All right. 25 So let's plug into our expression, 26 the number of hours that he worked for Ms. 27 Sanchez. So C is equal to 75 X plus two 28 plus 1 25, and we get 75. 29 Let's distribute that out. We get 75 X plus 30 75 times...