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Step-by-step explanation:
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Step-by-step explanation:
h1=h2 (given).......eq1
b2=12
b1=?
ratio of area of triangle =4/5
(1/2×b2×h1)/(1/2×b1×h2) = 4/5
12×h1/b1×h1 =4/5
b1=12×5/4=3×5=15 Answer
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