What is an equation?
A statement which contains the equal sign = is known as an equation. eg; 2x -4x=2x , 45=0 1. The sum of the ages of anup and his father is 100. When anup is as old as his father now, he will be 5 times as old as his son anuj is now. Anuj will be eight years older than anup is now, when anup is as old as his father. What are their ages now? Let the present ages (in years) of Anup’s father, Anup and Anuj be x, (100 – x) and respectively. Difference between Anup’s father and Anup’s ages (in years) = x – (100 – x) = x – 100 + x = 2x – 1002x – 100 years later, Anup will be x years old and 5 times old as Anuj is now.X = 5y y = x/5 -----------(i) When Anup is x yr old,then Anuj will be y +(2x-100)yrs old and 8yrs older than Anup is nowTherefore y + (2x-100) = (100 – x ) + 8 -------------(ii) On putting y = x/5 from (i) we get X = 65 yrs So Anup’s fathers age = 65 yrs, Anup’s age = 100-65 = 35 yrs , Anuj ages = x/5 = 65/5 = 13 yrs 2. I am currently 5 times as old as my son. In 6 years of time I will be three times as old he will be then. What are our ages now? Let the Age Of Me Be 5x And Sons be x. After 6 Years 5x+6 And x+6 It is Given that I Would Be Three Times The Age Of My Son 5x+6 = 3(x+6) 5x+6 = 3x+18 Þ 5x-3x = 18-6 2x = 12Þx = 6 So My Age = 6x5 = 30 Answer: My Age- 30 Years, Sons Age 6 Years See full solved questions Read For: VIII Linear equations of one variables test paper-1 VIII Linear equations of one variables test paper-2 VIII Linear equation of one variables test paper-3 VIII Linear equations of one variables test paper-4 VIII Linear equations of one variables test paper-5 Visit Download sections
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Exponent or power Test paper Mock Test and AssignmentsExponent or power is a mathematical representation that indicates the number of times that a number is multiplied by itself.
If a number is multiplied by itself m times, then it can be written as: a x a x a x a x a...m times = a^m Exponents and Powers Negative integral Exponents, Laws of integral Exponents, Expressing Numbers in the Standard Form, Converting Numbers from Standard Form to Usual Form. 8th Exponent and Power CBSE Test Paper - 01 Download File 8th Exponent and Power CBSE Test Paper - 02 Download File 8th Exponent and Power CBSE Test Paper - 03 Download File 1. If a die is thrown once, what is the probability of getting a prime number?
2. A coin is tossed 200times and tail is obtained 128 times. Now, if a coin is tossed at random, what is the probability of getting a tail? 3. In 100 throws of a dice, 5 is obtained 42 times. In a random throw, what is the probability of getting a 5? 4. A bag has 6 red balls and 8green balls. A ball is drawn from a bag without looking in to the bag. What is the probability of getting a green ball? 5. What is the probability of occurrence of an event? 6. There are 216workers in a factory and in which 75are laborers. What would be the central angle of the sector representing laborers in the pie chart ? 7. If 45%of the people residing in a locality are Hindus, then what is the central angle of the sector representing the Hindus in the pie chart? 8. The weekly pocket expenses (in rupees) of 30students of a class are given below: 62 ,80 ,110 ; 75 ; 84 ; 73 , 60 , 62, 100 , 87 , 78 , 94 ,117, 86, 65, 68,; 90,; 80,118 ,72; 95; 72; 103; 96; 64; 94; 87; 85; 105; 115 Construct a frequency table with class intervals 60-70 and so on. 9. The marks of a student in different subject are given below: Represent the below data by a bar graph. Subject Maths Science Hindi English Social science Marks 75 70 50 55 65 Visit Data Handling Page >>>>Click Here>>>>> |
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