exam Maths Puzzle Numerical Ability

One number is 3 units larger than twice another number. If their sum is zero, find the two numbers?

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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 Joe has a collection of nickels and dimes that is worth $6.00. If the number of dimes were doubled and the number of nickels were increased by 6, the value of the coins would be $9.90. How many dimes does he have?