exam Maths Puzzle Numerical Ability

Find the sum or difference. - 11/12 - -7/15

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exam Other Question

THE QUANTITY y VARIES AS x AND INVERSELY AS z. IF y=15 WHEN x= 50 AND z= 10, FIND y WHEN x= 65 AND z= 5.

PLEASE HELP ME LEARN HOW TO EVEN BEGIN THIS PROBLEM.. I DO NOT EVEN KNOW Ms. Mills invested her $20,000 bonus in two accounts. She took a 4% loss on one investment and made a 12% profit on another investment, but ended up breaking even. How much was invested in each account?