book Maths Puzzle Numerical Ability

Aaron has P36.00 in 25 cents, 10 cents and 5 cents coins. He has 4 times as many as 5 coins and the number of 10 cents is thirty more than the number of 25 cents coins. How many coins of each kind does he have?

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book Other Question
The sides of the triangle are 6,7,and x. What is the largest value that could be the area of such a triangle? when a postive is multiplied by a negative is the solution a postive or a negative? i think it is postive but im not sure...