exam Maths Puzzle Numerical Ability

Please someone help...I've been trying to figure where I'm going wrong....I get almost to the end and my last fraction is always wrong...so I'm not multiping somewhere right....

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exam Other Question

A PICTURE THAT MEASURES 12 CM BY 18 CM IS ENLARGED TO FOUR TIMES ITS AREA. WHAT ARE THE NEW DIMENSIONS OF THE PICTURE? The second of three numbers is 1 less than the first. The third number is 5 less than the second. If the first number is twice as large as the third, Find the three numbers.