book Maths Puzzle Numerical Ability

wHAT IS THE FORMULA TO FIGURE OUT 35 IS 65% OF WHAT NUMBER? THANK YOU

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book Other Question

Let A be an mxn matrix for rank r and let {x, ..., xr} be a basis for R(A^T). Show that {Ax,..., Axr} is a basis for R(A). Divide: x^3+2x^2+x+12 / x+3

Is it x^2+x+4?