book Maths Puzzle Numerical Ability

Irma invested some money a 7% and $100 less than that at 8%. Her total interest was $58. How muc did she invest at 7%, rounded to the nearest dollar?

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Is this corect:if rank of matrix A is <= n-2 than rank of adj(A)=0 Find the length of a rectangle meeting the specified conditions: The perimeter is 210 feet and the length is 110 percent of the width. You have to put ft after your answer