book Maths Puzzle Numerical Ability

Please help me solve this problem: The ratio of the weight of an object on Jupiter to its weight on Earth is 8 to 3. How much would a 100 pound person weigh on Jupiter?

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book Other Question

John wants to order a pizza with one topping, he can have either thin crust or regular crust, his topping choices are onions, pepperoni, mushrooms or sausage. How many different choices of pizza does John have.

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How do you write up and find the prime factorization of the number 20?