book Maths Puzzle Numerical Ability

Cynthia invested three times as much money at 6% as at 5%. If the total simple interest for one year is $1150, how much has Cynthia invested at 5%?

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book Other Question

Consider the relationship E X E, where E ={-2,3,4,5,9} List the ordered pairs
determined by {(x,y):> 4 and y < 4}
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A rectanguliar field is 5 times as long as it is wide, with a perimeter of 288 yards. (Please help!!)


Thank you in advance:)