exam Maths Puzzle HR Interview Interview

What is the smallest number that has exactly 12 factors?

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answer is 60 because There are 13 numbers which have 12 factors. The numbers are 60, 72, 84, 90, 96, 108, 126, 132, 140, 150, 156, 160, 198 so the least number is 60
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exam Other Question

If f(x) is the number of primes less than or equal to x, find the value of f(90) - f(80). The difference between the ages of two brothers is a prime number. Sum of their ages is also a prime number. If the elder brother is 28 years old, how many different values can the age of the younger brother take?