Explanation for Question 2 From the Math (No Calc) Section on the 2017 April Sat
Question two says the formula above gives the monthly cost C in 2 dollars of operating of delivery truck. 3 When the driver works a total of X hours, 4 and when wide gallons of gasoline are used, 5 if in a particular month, it costs no more than $2,000 to operate 6 the truck. And at least 150 gallons gas were used. 7 What is the maximum number of hours the driver could have worked? 8 So we know that a cost no more than 2000. 9 So we can set this up as 2000 is greater than or equal to 10 10 X plus four Y. And we also know that what, 11 why is it's 150? So we can plug that into this equation. 12 And our starting equation is 2000 is greater than or equal to 10 X 13 plus four times one 50. Then we can rewrite this as 2000 14 is greater than or equal to 10 X plus 600, 15 which is just four times one 50. 16 And we can subtract 600 from both sides to get 1,400 17 is greater than or equal to 10 X. 18 Finally, we can divide both sides by 10 to get 140 is greater 19 than or equal to X, or which tells us that the 20 answer is answer choice B.