पृष्ठीय क्षेत्रफल और आयतन | Class 9 NCERT गणित | 8 PM Class by Mohammad Sir | L1 | Hindi Medium

The ratio of curved surface area and volume of a cylinder is 1: 7. The ratio of total surface area and volume is 187 : 770. What is the respective ratio of its base radius and height? एक बेलन के वक्र पृष्ठीय क्षेत्रफल तथा आयतन का अनुपात 1 : 7 है। कूल पृष्ठोय क्षेत्रफल तथा आयतन का अनुपात 187 : 770 है। इसके आधार की त्रिज्या तथा ऊँचाई क्रमशः अनुपात क्या है? Option 1- 5 : 8 Option 2- 4 : 9 Option 3- 3 : 7 Option 4- 7 : 10

If the area of the circular shell having inner and outer radius of 8 cm and 12 cm respectively is equal to the total surface area of a cyclinder of radius R_1 and height h, then h in terms of R_1 will be ____. यदि एक वृत्ताकार सेल का क्षेत्रफल जिसकी अंत तुथा बाहस त्रिज्या क्रमशः 8 सेमी और 12 सेमी है। एक बेलन के सम्पूर्ण पृष्ठीय क्षेत्रफल जिसकी त्रिज्या R_1 और ऊँचाई h बराबर है, तो h, R_1 को पदों में होगा?

Ratio of the fares of First ,Second and Third class catogory of a train , between two stations is 10:7:2 and the ratio of passenger travelling in these category is 4:9:17 respectively .If the fare is increased by 1/4 in First class , 1/8 in second class and decreased by 10% i Third Class and the ratio of number of passenger in the category remains same .If the total amount received of Rs. 60590 , then find the total amount received from thrid class category .

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12 (i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 - 10. (ii) How many children watched television for 15 or more hours a week?

Between two railway staions the fare of 1^(st), 2^(nd) and 3^(rd) class are in the ratio 8:6:3. But later on the fare of 1^(st) and 2^(nd) class is decreased by (1)/(6) and (1)/(12) spectively. In one year the no. of passengers of 1, 2nd and 3rd class are in the ratio for 4:9:24. If total tickets amounting Rs 355600 are sold then find the fare of all 3rd class.

In a class of 50 students, 23 speak English, 15 speak Hindi and 18 speak Punjabi. 3 speak only English and Hindi, 6 speak only Hindi and Punjabi and 6 speak only English and Punjabi. If 9 speak only English, then how many speak all the three? (a) 1 (b) 2 (c) 3 (d) 5

The marks obtained by 40 students of class IX in an examination are given below: 18, 8, 12, 6, 8, 16, 12, 5, 23, 2, 16, 23, 2, 10, 20, 12, 9, 7, 6, 5, 3, 5, 13, 21, 13, 15, 20, 24, 1, 7, 21, 16, 13, 18, 23, 7, 3, 18, 17, 16 Present the data in the form of a frequency distribution using the same class size, one such class being 15-20 (where 20 is not included)

The marks obtained by 40 students of class VIII in an examination are given below: 18,8,12,0,8,16,12,5,23,2,16,23,2,10,20,12,9,7,6,5,3,5, 13,21,13,15,20,24,1,7,21,16,13,18,23,7,3,18,17,16 Present the data in the form of a frequency distribution using the same class size, one such class being 15-20 (where 20 is not included).