exam Maths Puzzle Numerical Ability

Tanisha has 70 coins, all quarters and dimes. There are 30 more quarters than dimes. Fine the number of each type of coin.

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exam Other Question

I THINK that this is a linear equation problem. Can you help me solve this? I don't know how to solve for multiple variables in this way:
{{{2x+2z=2}}}

{{{5x+3y=4}}}

{{{3 How would you solve the equation 2a-6=-a?