Explanation for Question 1 From the Math (Calc) Section on the 2020 March Sat
So question number one on the math calculator section tells us the S is 2 equal to four, and we need to find the value of 20 S minus 3 15 S so let's start by rewriting this equation. 4 It's once he S minus 15 S that looks like 5 a five. There we go. And we're told that S is equal to four. 6 So essentially what this means is that we can take the S as equal 7 to four and just plug it in wherever we see an S in our 8 equation. So instead of SS, 9 I'm going to rewrite our equation with fours. 10 So it'll be 20 times, four minus 15 times four, 11 and we have a calculator. So this is something you could plug in really 12 easy, but you can also do this math nice and quickly in your head, 13 right? 20 times four, it's going to be 80 15 times four is going 14 to be 60, not 16, 15 60. And when you do 80 minus 60, 16 you get 20. And that leads us to our correct answer of de.