book Maths Puzzle Numerical Ability

a coin collection contains nickels, dimes, quarters and pennies. the face value of the pennies was $8. there were seven more than three times as many quarters as dimes and sixteen

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I would please like your help with this problem: 5x-3(2x-1)=5-3(-x+2) When the Intitail amount under compound interest is 102.5. And the initial amount under simple interest is 100. Both for a period of two years then what is the principal amount ?