exam Maths Puzzle Numerical Ability

I have eight more quarters than dimes. If the coins are worth $6.20, how many dimes are there?

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exam Other Question

[4x 3y]=[12 -1]

Please Explain because my Teacher did not i cant figure this one out
a collection of 50 coins is worth 5.20$ there are 12 more nickels than dimes, and the rest r quarters. how many coins of each type r in the collectio