Answer:
w = 10
Explanation:
The area of triangle : h×b/2 (h:height, b:base) ➡ 8×6/2=24cm^2
The area of rectangle :l×w (l:length, w:width) ➡ 12w
The area of the rectangle is 5 times the are of triangle so, 12w = 24×5 ➡w = 10
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