NCERT/CBSE MATHEMATICS CLASS 11 textbook ( ) ( ) ( ) ( ) ( ) ( ) ( )

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Answers to NCERT/CBSE MATH (Class XI)textbook. 6. LINEAR INEQUALITIES. 45 1125. 13.The amount of acid in 1125lt of the 45% solution= 45% of 1125=.
NCERT/CBSE MATHEMATICS CLASS 11 textbook http://www.TutorBreeze.com MISCELLANEOUS EXERCISES Answers to NCERT/CBSE MATH (Class XI)textbook 6. LINEAR INEQUALITIES

45 × 1125 100 Let x lt of the water be added to it to obtain a solution between 25% and 30% solution

13.The amount of acid in 1125lt of the 45% solution= 45% of 1125=

45 100 < 30% ⇒ 25% < 1125 +x 45 1125 × 25 100 < 30 ⇒ < 100 1125 +x 100 25 1125 × 45 30 ⇒ < < 100 (1125 +x ) × 100 100 1125 ×

⇒ 25
> 25 1125 × 45 30 1125 × 45 1125 × 45 ⇒ > (1125 +x ) > 25 30 50625 50625 ⇒ > (1125 +x ) > 25 30 ⇒ 2025 > (1125 +x ) > 1687.5 ⇒

⇒ 2025 > (1125 +x ) > 1687.5 ⇒ 2025 − 1125 > x > 1687.5 − 1125 ⇒ 900 > x > 562.5 ⇒ 562.5 < x < 900 ⇒ Between 562.5 and 900 lt of water needs to be added.

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NCERT/CBSE MATHEMATICS CLASS 11 textbook http://www.TutorBreeze.com

Please do not copy the answer given here Write to us for help