Mental AbilityBasic Arithmetic (NCO Cyber Olympiad (SOF) Class 9): Questions 16  21 of 49
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Question number: 16
» Mental Ability » Basic Arithmetic
Question
Three years ago the average age of P and Q was 16 years. With R joining them, the average becomes 20 years. How old is R now?
Choices
Choice (4)  Response  

a.  22 years 

b.  34 years 

c.  45 years 

d.  12 years 

Question number: 17
» Mental Ability » Basic Arithmetic
Question
A man had 25 lamps. All but 15 broken, how many were left with him?
Choices
Choice (4)  Response  

a.  18 

b.  7 

c.  15 

d.  10 

Question number: 18
» Mental Ability » Basic Arithmetic
Question
In three colored boxespink purple, cyan orange and yellow aqua 180 balls are placed. There are twice as many balls in the orange and purple boxes combined as there are in the aqua box and twice as many in the aqua as there are in the purple box. How many balls are there in the orange box?
Choices
Choice (4)  Response  

a.  60 

b.  90 

c.  46 

d.  30 

Question number: 19
» Mental Ability » Basic Arithmetic
Question
How many liters of silicon solution should be added to 70 liters of a silicon solution to make a solution?
Choices
Choice (4)  Response  

a.  70 liters 

b.  80 liters 

c.  10 liters 

d.  20 liters 

Question number: 20
» Mental Ability » Basic Arithmetic
Question
In a family, the uncle took of the lava cake and he had 6 times as much as each of the other members had. The total number of family member is ________
Choices
Choice (4)  Response  

a.  43 

b.  31 

c.  39 

d.  21 

Question number: 21
» Mental Ability » Basic Arithmetic
Question
The ratio of the ages of Neeta and Ravi is 2: 5. After 8 years, their ages will be in the ratio of 1: 2. The difference in their present age is: (in years)
Choices
Choice (4)  Response  

a.  32 

b.  24 

c.  29 

d.  26 
