Multiple choice

The length and bredth of the rectangle are 30 cm and 25 cm respectively. If the length is increased by 20% and breadth is decresed by 30% the find the change in area. आयत की लम्बाई और चौड़ाई क्रमशः 30 सेमी और 25 सेमी है । यदि लम्बाई 20% बढ़ जाती है और चौड़ाई 30% तक कम हो जाती है तो क्षेत्रफल में परिवर्तन ज्ञात कीजिये ।

  1. 500 cm2/सेमी.2

  2. 630 cm2/सेमी.2

  3. 180 cm2/सेमी.2

  4. 120 cm2/सेमी.2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Original area = 30 × 25 = 750 cm². New length = 30 × 1.2 = 36 cm. New breadth = 25 × 0.7 = 17.5 cm. New area = 36 × 17.5 = 630 cm². Change in area = 750 - 630 = 120 cm² (decrease).

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