Ques:- the ratio of white balls to black balls is 1:2. if 9 balls are added then the ratio of the balls become 2:4:3. find the number of black balls.
A. 12
B. 6
C. 9
D. none
Ques:- can anybody solve this series 0,6,24,60,120,210,?,? please give answer with the solution
Recent Answer :
: copy cat
Ques:- The average marks in mathematics scored by the pupils of a school at the public examination were 39. If four of these pupils who actually scored 5, 12, 15 and 19 marks at the examination had not been sent up, the average marks for the school would have been 44. Find the number of pupils sent up for examination from the school?
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Ques:- There are 6 people W,H,M,C,G,F who are murderer , victim , judge , police, witness, hangman. There was no eye witness only circumtancial witness. The murderer was sentenced to death. Read following statement and determine who is who. 1. M knew both murderer and victim. 2. Judge asked C to discribe murder incident. 3. W was last to see F alive. 4. Police found G at the murder site. 5. H and W never met.
Recent Answer :
: F – Murderer
G – Victim
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Ques:- A certain sum is invested at simple interest at 18% p.a. for two years instead of investing at 12% p.a. for the same time period. Therefore the interest received is more by Rs. 840. Find the sum?
Recent Answer :
: let x be sum.
SI of 18% for 1 year= x*18/100=0.18x;
SI of 18% for 2 years is 0.36x;
SI of 12% for 1 year= x*12/100=0.12x;
SI of 12% for 2 years is 0.24x;
Given, 0.36x-0.24x=840
0.12x=840
x=840/0.12=7000.
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Ques:- What is the number of zeros of the product of the first 100 numbers ?
Recent Answer :
: 24.
exp: 0 is formed by multiplying 5 with 2. so first we find
how many 5’s and 2’s are there in 100!.
No of 5’s : 100/5=20/5=4/5.
20 +4 =24.
No of 2’s : 100/2=50/2=25/2=12/2=6/2=3/2=1/2.
50 +25 +12 +6 +3 +1.
It has 24 5’s and 2’s.
so the no. of zeros=24.
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A. 15
B. 20
C. 30
D. 35
Recent Answer :
: 15
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these are question tht are seem to be like it consumes
time. so dont see jus the question and run to the next .
ans. a) 12
if 9 balls are added then the ratio to the combination
becomes 2:4:3.
9 balls make the ratio 3 for grey balls in tht mixture.
so the factor is 9/3 = 3 (in tht mixture)
so the same factor has to be maintained through out the
ratio. so black balls is 4 * 3 = 12 and white balls is 2 *
3 = 6.