exam Maths Puzzle Numerical Ability

wich number is a prime number
1
12
31
99

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exam Other Question

If an earthquake measured 5.9 on the richter scale, what was the intensity of the earthquake? Neeed to use the formula M=log(A/Ao). The sum of three numbers is 26. Twice the first minus the second is two less than the third. The third is the second minus three times the first. Find the numbers.
X+Y+Z=26