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Online Quiz (Worksheet A B C D)

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High School Mathematics - 2
7.11 Graphical Representation of Solutions of Inequalities

Example 1: Solve 7x+3 < 5x+9
Solution: We have 7x+3 < 5x+9
2x < 6 or x < 3

Example 2: The marks obtained by a student in his exams are 62 and 48. What marks should he get in his next test to get an average of 60?
Solution: (62+8+x)/3 > = 60
x > = 70
Answer: The student must obtain a minimum of 70 marks to get an average of 60.



Q 1: A solution of 8% boric acid is to be diluted by adding a 2% boric acid to it. The resulting mixture is to be more than 4%but less than 6% boric acid . If we have 640 litres of the 8% solution, how many litres of the 2% solution will have to be added?
less than 3 20 litres
more than 1280 litres
more than 320 litres but less than 1280 litres

Q 2: IQ of a person is given by the formula IQ = MA/CA * 100 where MA is mental age and CA is chronical age. If 80 <= IQ <= 140 for a group of 12 year children, find the range of their mental age.
More than 16.8
Atleast 9.6 but not more than 16.8
Less than 9.6

Q 3: 37 - (3x+5) >= 9x-8(x-3)
Answer:

Q 4: x/2 < = (5x-2)/3 - (7x-3)/5
Answer:

Q 5: (3x-4)/2 >= (x+1)/4 -1
Answer:

Q 6: 5x-3 > = 3x-5
Answer:

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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