[Video] Q38: Slab 2 has a ratio of length to width of 5 to 2. how many centimeters wide is slab 2 ?

Explanation for Question 38 From the Math (Calc) Section on the 2019 April Sat

And number 38, we are told that slab two has a ratio of length 2 to width, a five to two, and we want to know how many centimeters 3 wide slab two is. So if we read out the information length to width 4 is equal to five to two. 5 Another way to write ratios is as fractions. 6 So length over with is going to equal five over two. 7 So now we're looking for how many centimeters wide is slab two. 8 So if we look at the row with slab two, 9 we can find our length is 1 25. 10 So we can plug that in here. 1 25 over the width is equal 11 to five over two. So now we can cross multiply to find the value 12 for w 1 25. 13 Times two is equal to five times w so 14 250 equals five w then if we 15 divide by five on both sides, 16 the width is equal to 50.