Update GradCylinder3.pg

Added hints

ProblemLibrary/setCH151_Measurement/GradCylinder3.pg

@@ -65,6 +65,7 @@ my @image;
 $ans0 = $measurement[$a];
 $m0 = InexactValue($ans0, 3, { tolerance => 0.03});
 $m0uncert = $m0->simpleUncertainty;
+$tick0 = $m0uncert*10;
 $image0 = $cylinder[$a];
 $alt0 = $altcylinder[$a];
 
@@ -87,6 +88,7 @@ my @image;
 $ans1 = $measurement2[$b];
 $m1 = InexactValue($ans1, 3, { tolerance => 0.3});
 $m1uncert = $m1->simpleUncertainty;
+$tick1 = $m1uncert*10;
 $image1 = $cylinder2[$b];
 $alt1 = $altcylinder2[$b];
 
@@ -114,7 +116,15 @@ b)  [@ image( $image1, width=>105, height=>330,
 END_PGML
 ############################################################
 BEGIN_PGML_HINT
+1. When measuring liquid that has a menicus, always read from the bottom of the curve. 
 
+2. What is the quantity measured by the smallest lines on the graduated cylinder in these examples? In other words, how far apart are these markings?
+
+        a. [$tick0] mL
+
+        b. [$tick1] mL
+
+    This means that the measurement for these devices should be *one digit more precise* than this. This is called the guess digit and this will define the uncertainty for that measurement. 
 
 To review significant figures and measurement, click [@ htmlLink( protect_underbar("https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Map%3A_Introductory_Chemistry_(Tro)/02%3A_Measurement_and_Problem_Solving/2.03%3A_Significant_Figures_-_Writing_Numbers_to_Reflect_Precision"), protect_underbar("here"), "TARGET='_blank'" ); @]*
 
@@ -140,4 +150,4 @@ END_PGML_SOLUTION
 
 
 
-ENDDOCUMENT();
+ENDDOCUMENT();