book Maths Puzzle Numerical Ability

i have a problem... 2/7=x/-42
I know you cross multiply
7x=-84
x=-84-7
x=-91
Im i right?

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book Other Question

the perimeter of an NBA sized basketball court is 288ft. the length is 44ft longer than the width. find the dimensions of the court. 7. Chrissy’s Fine Fashions has an average collection period of 40 days. The accounts receivable balance is $80,000. What is the value of its credit sales?