book Maths Puzzle Numerical Ability

solve for x
ax + by = c

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book Other Question

I need help with this question on exponents and roots, My question is Simplify the expressionThe square root of 96/8? This is supose to be a fraction, please help me if you can, Please. Some dimes and pennies are in a stack.
They have a total value of $2.31.
How many dimes are in the stack if there are twice as many dimes as pennies?