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Neelam Kumari posted an Question
May 27, 2021 • 20:54 pm
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250 points
250 points
- UGC NET
- Commerce
Xe in he scho 15. if 60% of the students in a school are boys and number of girls 1s 812, how many boys are ther (b) 2030 (a) 1128 (d) 1281 (c) 1821 16. it take
xe in he scho 15. If 60% of the students in a school are boys and number of girls 1s 812, how many boys are ther (B) 2030 (A) 1128 (D) 1281 (C) 1821 16. It takes eight hours for a 600 km iourney, if 120 km is done by train and tne rest by car. It takes Od is. es 20 minust more, if 200 km is done by train and the rest by car. The ratio of the speed of the train to that of th (A) 3:5 (B) 3:4 (D) 4:5 (C) 4:3 7 lt 177 is divided into 3 parts in the ratio 1/2: 2/3: 4/5, then the second part 1s (A) 75 (B) 45 (C) 72 (D) 60
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Durgesh rawat
16 Correct option is 3:4 Let the speed of the train be x km/hr and that of the car be y km/hr. Then, x120+y480=8⇒x1+y4=151....(i) And, x200+y400=325⇒x1+y2=241....(i) Solving (i) and (ii), we get: x = 60 and y = 80. ∴Ratio of speeds = 60 : 80 = 3 : 4.
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Durgesh rawat
15- 60%are boys so 100-60=40 40%are girls 812/40×100 2030 are total student so no of boys = 2030-812 =1218 are the boys
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Neelam kumari
thanks❤🌹 for all
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Sapare bhavani bai
![best-answer]()
pls find the attachment
![cropped3558065610855742730.jpg]()
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Dhruval Shah
que no 17 option no D
![cropped3545116047488453865.jpg]()
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Rucha rajesh shingvekar
1218
![cropped1218952443111357282.jpg]()
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Durgesh rawat
17- The given 3 parts may be taken as x/2, 2x/3 and 4x/5 respectively. ⇒ (x/2) + (2x/3) + (4x/5) = 177 ⇒ (15x + 20x + 24x)/30 = 177 ⇒ 59x = 177 × 30 ⇒ x = (177 × 30)/59 = 90 ∴ Second part = 2x/3 = 2 × 90/3 = 60 Smart trick Given ratio = 1/2 : 2/3 : 4/5 = 15 : 20 : 24 Hence, 2nd part will be multiple of 20. Only one option i.e. 60 is multiple of 20. Hence, 60 will be correct answer.