Mathematics [NSTSE (National Science Talent Search Exam Unified Council) Class 8]: Questions 70  73 of 1201
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Question 70
Question
MCQ▾The twice the son’s age in years is added to the father’s age, the sum is 50. But if twice the father’s age is added to the son’s age, the sum is 85. Then the ages of father and son respectively are:
Choices
Choice (4)  Response  

a.  45 yrs, 10 yrs  
b.  30 yrs, 15 yrs  
c.  40 yrs, 5 yrs  
d.  25 yrs, 10 yrs 
Question 71
Question
MCQ▾How much pure alcohol should be added to 300 ml of strength 20 % to make its strength 45%?
Choices
Choice (4)  Response  

a.  198 ml  
b.  154 ml  
c.  167.36 ml  
d.  136.36 ml 
Question 72
Question
MCQ▾Express as rational number.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 73
Question
MCQ▾PQ and RS are diameters. Then PRQS is:
Choices
Choice (4)  Response  

a.  Isosceles trapezium  
b.  Rectangle  
c.  Trapezium  
d.  Square 