exam Maths Puzzle Numerical Ability

Translate the following problems into algebraic equations :

1) 42 is 40% of what number?

2) 15 is what percent of 3?

3) The sum of the page numbers on facing pages of a book is 157; what are the page numbers?

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exam Other Question
WHAT IS THE EXACT VALUE OF THE FOLLOWING?

1) SIN 9PI/2

2) COSECANT 7PI I really need help with this question: find the roots of the polynomial equation, and state the multiplicity of each root P(x)=-1/2(x+3)(x+4)^3(2x+1)