book Maths Puzzle Numerical Ability

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

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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? The sum of the counting numbers from 1 to 5 can be represented by drawing a triangle of dots as shown at left. A rectangle can be formed by copying the triangle and rotating it. Th