Explanation for Question 3 From the Math (No Calc) Section on the 2019 March Sat
Question three says the clothing store is having a sale on shirts and pants 2 during the sale. The cost of each shirt is $15 and the cost of 3 each pair of pants is $25. Jeff can spend at most $120 4 at the store if Jeff buys S shirts and P pairs of pants, 5 which of the following must be true. 6 So again, I think it's helpful to mark up the passage to make sure 7 we know which variables go with which numbers and what the total is. 8 So I'm going to start by drawing a triangle around the total 120. 9 I know that's going to be on the right side of the equation by 10 itself because that's the most he can spend at the store. 11 I'm also going to note the word most, 12 which means however much he spends is going to be less than or equal 13 to 120. Now I need to fill in the left side of the equation. 14 Now, if you read the answer, you'll see that each shirt is $15 15 and shirts are represented by the variable S alternatively, 16 each pair of pants, which I'm going to put in a rectangle is $25 17 and represented by the variable P. 18 So that tells me that I'm going to need to write 15 S plus 19 25 P on the left side of the equation, 20 because I'm multiplying the price of the shirts by the amount of shirts spot 21 and adding that to the price of the pants times, 22 the amount of pants bought, 23 and that should be less than or equal to the total amount that Jeff 24 can spend at the store. And that's why our answer should be.