Section B last sum. Or
The last sum on the page
Q.11. A swimming pool can be filled in 4 hours by 8 pumps of the same type. How many pumps will be required to fill the same pool in $2 \frac{2}{3}$ hours?

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Solution

Dear Student,
$∵ 240 m i n s t a k e n t o f i l l a s w i m m i n g p o o l b y 8 p u m p s 1 m i n t a k e n t o f i l l a s w i m m i n g p o o l b y 8 \times 240 p u m p s (I n v e r s e l y p r o p o r t i o n a l t o e a c h o t h e r) ∴ 160 m i n t a k e n t o f i l l a s w i m m i n g p o o l b y \frac{8 \times 240}{160} = 12 p u m p s$
Regards

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Section B last sum. Or The last sum on the page Q.11. A swimming pool can be filled in 4 hours by 8 pumps of the same type. How many pumps will be required to fill the same pool in 223 hours?

Dear Student, ∵ 240 mins taken to fill a swimming pool by 8 pumps1 min taken to fill a swimming pool by 8×240 pumps Inversely proportional to each other∴ 160 min taken to fill a swimming pool by 8×240160=12 pumps Regards

Section B last sum. Or
The last sum on the page
Q.11. A swimming pool can be filled in 4 hours by 8 pumps of the same type. How many pumps will be required to fill the same pool in $2 \frac{2}{3}$ hours?