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CBSE Class 10 Answered

In an examination one mark is awarded for every correct answer and 4 mark is deducted for every wrong answer. A student answered 120 questions and got 90 marks. How many questions he answered correctly?
Asked by bis0584 | 30 May, 2015, 10:44: PM
answered-by-expert Expert Answer
L e t space t h e space n u m b e r space o f space c o r r e c t space q u e s t i o n s space b e space apostrophe x apostrophe space a n d space n o. space o f space i n c o r r e c t space q u e s t i o n s space b e space apostrophe y apostrophe. x plus y equals 120 rightwards double arrow 4 x plus 4 y equals 480.... left parenthesis i right parenthesis x minus 4 y equals 90...... left parenthesis i i right parenthesis left parenthesis i right parenthesis plus left parenthesis i i right parenthesis comma 5 x equals 570 x equals 114 x plus y equals 120 y equals 120 minus 114 y equals 6 N o. space o f space c o r r e c t space q u e s t i o n s space equals space 114
Answered by Prasenjit Paul | 31 May, 2015, 07:26: PM

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CBSE 10 - Maths
2/x+2/3y=1/6; 3/x+2/y=0
Asked by aditikaldate7 | 21 Apr, 2024, 03:16: PM
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CBSE 10 - Maths
from the pair of linear equations in the following problems and find their solution graphically 10 students of class 10 to part in a mathematic quiz if the number of girls is for more than the number of boys find the number of boys and girls who took part in the quiz
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CBSE 10 - Maths
The value of 'x' and 'y' when x+y=6 and x-y=10 a) (8,-2) b) (-2,8) c) (8,2) d) (2,8)
Asked by suvarnam458 | 23 Feb, 2024, 06:18: PM
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CBSE 10 - Maths
Present age of 'A' is 4 years less than that of 'B'. Age of 'C', 4 years hence from now will be 60% more than the age of 'B', 4 years ago from now. Find the present average age of 'A' and 'B' together if the sum of present age of 'A' and 'C' is 48 years.
Asked by jhajuhi19 | 01 Feb, 2024, 08:43: AM
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CBSE 10 - Maths
Data given below is related to daily routine [study time (in hours), entertainment time (in hours) and rest time (in hours)] of three students A, B and C.    Daily routine (24 hours) = Study time + Entertainment time + Rest time   A's study time is 1 hour less than B's study time and A's rest time is 7 hours more than his entertainment time. Ratio of A's entertainment time to B's entertainment time is 1: 2. Average of study time of A, B and C is 6 hours. Average of rest time of A and B is 9 hours. Ratio of C's entertainment time to his rest time is 4: 3.   If B's study and entertainment time is m% more than C's study and entertainment time together, then find that B's study and entertainment time together is what percent more than A's study and entertainment time together?
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Asked by jhajuhi19 | 31 Jan, 2024, 11:21: PM
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CBSE 10 - Maths
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Asked by imalakondarayudu1 | 30 Jan, 2024, 06:43: AM
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CBSE 10 - Maths
If 8x+5y=9&mx+10y=15 are an inconsistent pair of linear equations, then the value of m is
Asked by sbalmeeri | 29 Jan, 2024, 07:19: PM
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CBSE 10 - Maths
the numerator of fractions is 4 less than the denominator. if the numerator is decreased by 2 and the denominator is increased by 1 , then the denominator is 8 times the numerator. find the fraction.
Asked by am.mansi628 | 29 Nov, 2023, 05:38: PM
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CBSE 10 - Maths
10 students of class 10 took part in a mathematics quiz . if the number of girls is 4 more than the number of boys then ,find find the numbers of boys and number of girls who took part in the quiz
Asked by jaanooru | 13 Oct, 2023, 10:23: PM
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CBSE 10 - Maths
write an equation which represents a coincident to the line represented by the equation2x-3y+5=0
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Asked by mindu2109 | 05 Oct, 2023, 06:19: AM
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