exam Maths Puzzle Numerical Ability

write an expression for three times the difference of a number x and 5

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exam Other Question

Please help with the following :

Name the set of sets of numbers to which the given real number belongs

0.1 1.How i find smallest positive number in the A.P 500,493,486,479......
2.How I find the smallest number of terms of A.P -54,-52.5,-51,-49.5..which musr be taken for the sum of the terms to be positive.