exam Maths Puzzle Numerical Ability

The Variables x and y vary inversely. y=3/5 when x=7/2 Find an equation that relates the variables

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exam Other Question

WALT MADE AN EXTRA $9000 LAST YEAR FROM A PART-TIME JOB. HE INVESTED PART OF THE MONEY AT 7% AND THE REST AT 10%. HE MADE A TOTAL OF %720 IN INTEREST. HOW MUCH WAS INVESTED AT 10 One-third of a number is 5 less than half of the same number. What is the number?