exam Maths Puzzle Numerical Ability

Could I please have some help solving this problem. Thank you. x varies directly with y and inversely with z. x=0.25 when y=10 and z=20. find x when y=20 and z=10. Thank you...

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exam Other Question

Graph each of the following inequalities.
4x+ y>_ 4 The amount of a radioactive tracer after t days is given by A=A lower case o e^-0.18t, where A is the starting amount at the beginning of the time period. How much should be acquired now to have 40 grams remaining after 3 days?