exam Maths Puzzle Numerical Ability

i have to show whether the following numbers are divisible by 2,3,or 5...The work needs to be shown. the numbers are 925, 165,351, and 1,495

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exam Other Question

aw^2 - 10w + 3 = 0, whare a is a real number and w is a variable

if w = 1/2 is a solution to the equation, determine:
(a) the value of a
(b) the other solution to the quadrat What symbols and/or abbreviations are used to show the set of real numbers and the different subsets of real numbers?