add the multiplication of fractions function

mathgenerator/mathgen.py

@@ -387,6 +387,29 @@ def primeFactors(minVal=1, maxVal=200):
     solution = f"{factors}"
     return problem, solution
 
+def multiplyFractionsFunc(maxVal=10):
+    a = random.randint(1, maxVal)
+    b = random.randint(1, maxVal)
+    c = random.randint(1, maxVal)
+    d = random.randint(1, maxVal)
+    while (a == b):
+        b = random.randint(1, maxVal)
+    while (c == d):
+        d = random.randint(1, maxVal)
+    def calculate_gcd(x, y):
+        while(y):
+            x, y = y, x % y
+        return x
+    tmp_n = a * c
+    tmp_d = b * d
+    gcd = calculate_gcd(tmp_n, tmp_d)
+    x = f"{tmp_n//gcd}/{tmp_d//gcd}"
+    if (tmp_d == 1 or tmp_d == gcd):
+        x = f"{tmp_n//gcd}"
+    problem = f"({a}/{b})*({c}/{d})"
+    solution = x
+    return problem, solution
+
 # || Class Instances
 
 #Format is:
@@ -419,4 +442,5 @@ systemOfEquations = Generator("Solve a System of Equations in R^2", 23, "2x + 5y
 distance2Point = Generator("Distance between 2 points", 24, "Find the distance between (x1,y1) and (x2,y2)","sqrt(distanceSquared)", distanceTwoPointsFunc)
 pythagoreanTheorem = Generator("Pythagorean Theorem", 25, "The hypotenuse of a right triangle given the other two lengths a and b = ", "hypotenuse", pythagoreanTheoremFunc)
 linearEquations = Generator("Linear Equations", 26, "2x+5y=20 & 3x+6y=12", "x=-20 & y=12", linearEquationsFunc) #This has multiple variables whereas #23 has only x and y
-primeFactors = Generator("Prime Factorisation", 27, "Prime Factors of a =", "[b, c, d, ...]", primeFactors)
+primeFactors = Generator("Prime Factorisation", 27, "Prime Factors of a =", "[b, c, d, ...]", primeFactors)
+fractionMultiplication = Generator("Fraction Multiplication", 28, "(a/b)*(c/d)=", "x/y", multiplyFractionsFunc)