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The length of a rectangul has increased in the ratio 3:2 and the width reduced in the ratio 4:5.If the original length and width were 18cm and 15cm respectively. Find the ratio of change in it's area

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L2 = 1.5 L
W2 = 0.8 W
L2*W2 = 1.5 * 0.8 L W = 1.2 * LW
1.2= 12/10 = 6/5

or just
3/2 * 4/5= 6/5
but that is too easy

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