exam Maths Puzzle Numerical Ability

simplify/solve it reads x-1 over x-3 is equal to 2 over x-3:

x-1 2
--- = ---
x-3 x-3

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exam Other Question

Can someone please help me with this problem?

Find a1 in a geometric series for which Sn=189, r=1/2, and an=3. Ingredients for a recipe to serve 8 people.
24 oz pasta
6 2/5 tablespoons minced garlic
5 cups tomatoes
10 tablespoons cheese

What amounts would I use to make this recipe for 5 people?

Thanks so much!!!