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Mental maths

10 WBCS Math Questions - 12th Solved Arithmetic Practice Set

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12th WBSC solved question set to be used for arithmetic practice on simple interest, profit loss, number system, percentage, partnership, ratio, mixture and discount.

Solutions explain how to solve the questions easily and quickly. It should be useful for prelims of other competitive exams also...

Componendo dividendo uncovered to solve difficult Algebra problems quickly 5

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Occasionally the distinctive expression appears in one of the expressions, but its inseparable pair, the fraction of the two variables, is not readily available in the problem statement. We say in these cases that componendo dividendo appears in partial form, and the problem is of hidden componendo dividendo type. We need to change the given expression to match the target expression in such cases...

How to solve Surds part 3, Surd expression comparison and ranking

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In this third tutorial on how to solve surd problems, we will take up explaining two related problem classes, namely, two-term surd expression comparison and ranking. First we will state and explain two important rich concepts used for quick solution and then apply the rich concepts in solving chosen SSC CGL level problems...

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