Book Maths Puzzle Category

the ratio of salaries of a and b is 150%. if the salary of a increases by 20% and the ratio given decreases by 30 percentage points, what is the % increase/decrease in the salary of b

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Book Other Question
Find the irrational roots of the equation x^3-4x^2+2x+1=0 i forgot how to use simplest form and also hot to use algebraic form and i also forgot how to use the box and whiskers plot so can you help me please ?