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If The Length Of A Rectangle Is Increased By 20% And It’s Breadth Is Decreased By 20% Then It Area? |
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Answer» LET length = X METRES and breadth = y metres, then area =(XY) New length =(120/100x)m = 6x/5 m New breadth =(80/100 y)m New area =(6x/5 x 4y/5)m2 = (24/25 xy)m2 Decreased in area =(xy – 24/25 xy)m2= xy/25 m2 Decreased % =(xy/25 x 1/xy x 100)% = 4%. Let length = x metres and breadth = y metres, then area =(xy) New length =(120/100x)m = 6x/5 m New breadth =(80/100 y)m New area =(6x/5 x 4y/5)m2 = (24/25 xy)m2 Decreased in area =(xy – 24/25 xy)m2= xy/25 m2 Decreased % =(xy/25 x 1/xy x 100)% = 4%. |
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