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

x-y=2
4x-3y=11
How do I solve the sytem of equation using the subsitution method? Please show the work! This section is dealing with contradictions.

Show that the product of a non-zero rational number and an irrational number is an irrational number.