139. 64 : 144 : : 256 : ? | कक्षा 14 | सादृश्य या समानता | तर्क | संशय

In a class of 100 students, every student has passed in one or more of the three subjects, i.e. History, Economics and English. Among all the students , 24 students have passed in English only , 14 students have passed in History only, 11 students have passed in both English and Economics only, and 12 students have passed in both English and History only. A total of 50 students have passed in History. If only 5 students have passed in all three subjects, then how many students have passed in Economics only? 100 छात्रों की एक कक्षा में, प्रत्येक छात्र तीन विषयों यानी इतिहास, अर्थशास्त्र तथा अंग्रेजी में से एक या अधिक विषय में पास हुआ है | सभी छात्रों में से, 24 छात्र केवल अंग्रेजी में पास हुए हैं, 11 छात्र अंग्रेजी तथा अर्थशास्त्र दोनों में पास हुए हैं तथा 12 छात्र केवल अंग्रेजी और इतिहास में पास हुए हैं | इतिहास में कुल 50 छात्र पास हुए हैं | यदि सभी तीन विषयों में केवल 5 ही छात्र पास हुए हैं, तो केवल अर्थशास्त्र में पास करने वाले छात्रों की संख्या कितनी है ?

A room is 14.4 m long and 6.4 m wide. Its floor is to be covered with rectangular tiles of size 24 cm by 16 cm. Find the total cost of tiles at Rs. 15 per tile.

{:(,"Column A",,"Column B"),(14.,"Area of a trapezium is_______.",(a),4m^(2)),(15.,"If the volulme of a cube is" 512 cm^(3)", then the lateral surface are is ________.",(b),64 cm),(16., "If the diagonal of a square is" sqrt(8)m", then its area is ________.",(c ),((1)/(2))"(Sum of the parallel sides) (Distance between them)"),(17., "If the radius of the circle of angle" 45^(@)"is ______.",(d),((1)/(2))"(Product of the diagonals)"),(,,(e ),256cm^(2)),(,,(f),19.5 m^(2)):}

{((216)/(64))^((2)/(3))*(((256)/(81))^(-(1)/(4)))/(((16)/(144))^(-(1)/(2)))}^((1)/(2))