# Mathematics By Rd Sharma For Class 9th

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class mathematics ncert textbook unit hrishabh sharma

(see Fig 15.5) and then decreasing till 6 p.m. Notice that the temperature increased by 3 C(= 40 C – 37 C) during the period 6 a.m. to 10 a.m. There was no recording of temperature at 8 a.m., however the graph suggests that it was more than 37 C (How?). Example 1: (A graph on “performance”) The given graph (Fig 15.7) represents the total runs scored by two batsmen A and B, during each of the ten different matches in the year 2007. Study the graph and answer the following questions. (i) What information is .class mathematics ncert textbook unit hrishabh sharma

(Note that 2x : 5x is same as 2 : 5.) The difference between the two numbers is (5x – 2x). It is given that the difference is 66. Therefore, 5x – 2x = 66 or 3x = 66 or x = 22 Since the numbers are 2x and 5x, they are 2 × 22 or 44 and 5 × 22 or 110, respectively. The difference between the two numbers is 110 – 44 = 66 as desired. Example 11: Deveshi has a total of Rs 590 as currency notes in the denominations of Rs 50, Rs 20 and Rs 10. The ratio of the number of Rs 50 notes and Rs 20 notes is 3:5. If she .class mathematics ncert textbook unit xvi hrishabh sharma

Suppose Sundaram chooses the number ab, which is a short form for the 2-digit number 10a +On reversing the digits, he gets the number ba = 10b +When he adds the two numbers he gets: (10a + b) + (10b + a) = 11a + 11b = 11 (a + b). So, the sum is always a multiple of 11, just as Minakshi had claimed. Observe here that if we divide the sum by 11, the quotient is a + b, which is exactly the sum of the digits of chosen number ab. You may check the same by taking any other two digit number. The game between .chapter ncert knowledge hub for class 9th

Answer: In our day to day life, we can collect the following data.Number of females per 1000 males in various states of our countryWeights of students of our classProduction of wheat in the last 10 years in our countryNumber of plants in our localityRainfall in our city in the last 10 years Question 2: Classify the data in Q1 above as primary or secondary data. Answer: The information which is collected by the investigator himself with a definite objective in his mind is called as primary data whereas when.
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