Mental AbilityBasic Arithmetic (NCO Cyber Olympiad Class 9): Questions 32  37 of 49
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Question number: 32
» Mental Ability » Basic Arithmetic
Question
The sum of two angles of a triangles is 80° and their difference is 10°, find all the angles of the triangle.
Choices
Choice (4)  Response  

a.  25°, 35°, 110° 

b.  60°, 58°, 70° 

c.  45°, 45°, 90° 

d.  45°, 35°, 100° 

Question number: 33
» Mental Ability » Basic Arithmetic
Question
How much pure alcohol should be added to 400ml of a 15 % solution to make its strength 32%?
Choices
Choice (4)  Response  

a.  100 ml 

b.  95 ml 

c.  90 ml 

d.  80 ml 

Question number: 34
» Mental Ability » Basic Arithmetic
Question
Given , , and find the value of the following expression correct up to three places of decimal: .
Choices
Choice (4)  Response  

a.  3.78 

b.  3.88 

c.  2.88 

d.  2.67 

Question number: 35
» Mental Ability » Basic Arithmetic
Question
The bacteria in a culture grows by 20 % in the first hour, decreases by 10 % in the second hour and again increases by 20 % in the third hour. If at the end of the third hour the count of bacteria is 100000. The original count of bacteria in the sample is________
Choices
Choice (4)  Response  

a.  129300 

b.  129000 

c.  129900 

d.  129600 

Question number: 36
» Mental Ability » Basic Arithmetic
Question
Sterling gold is 92.5 % pure gold. How many grams of sterling gold must be mixed to a 90 % gold alloy to obtain a 500 gm of a 91 % gold alloy?
Choices
Choice (4)  Response  

a.  100 gm 

b.  50 gm 

c.  150 gm 

d.  200 gm 

Question number: 37
» Mental Ability » Basic Arithmetic
Question
Given , , and find the value of the following expression correct up to three places of decimal: .
Choices
Choice (4)  Response  

a.  17 

b.  12 

c.  10 

d.  30 
