book Maths Puzzle Numerical Ability

You have at least $30 in change in your drawer consisting of dimes and quarters. Write an inequality of coins in your drawer.

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I am trying to help my son with his algebra homework but never really understood it myself. Can you please explain how you solve negative and fraction problems. One such problem is x/-4 + 5 =1

thanks! I can not find my answer for problem 4307? help