exam Maths Puzzle Numerical Ability

72. A study by Dr. Aaron R. Folsom concluded that waist to hip ratios are a better predictor of 5 year survival than more traditional height to weight ratios. Dr. Folsom concluded

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Dante has Php19.50 in coins. if there were twice as many 5-centavos coins as 25-centavo coins, and as many 10-centavo coins as 5-centavo coins and 25 centavo coins combined, how many coins of each type were there? I need this worked out so I can understand on how to do it. Page 87
The problem is 12% of what is 48?