11. The average weight of 9 mangoes increases by 20 g if one of them weighing 120 g is replaced by another. The weight of the new mango is :
Answer:
Explanation:let the average of 9 mango is x
then total weight of 9 mango is 9x
now , according to qtn....9x-120 + y(weight of new mango) = (x+20)9
by solving this eqn...... y=300 g
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12. A and B together can do a piece of work in 12 days and A alone can complete the work in 18 days. How long will B alone take to complete the job?
Answer:
Explanation:A's one day work is 1/18
(A+B)'s one day work is 1/12
Thus, B's one day work is 1/12-1/18=1/36
So, B alone can complete the job in 36 days
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L&T Infotech
13. How many 4 digit integers formed between >990 and <5000 by using 0,4,5,7,8,9 repetition of integers are allowed?
Answer:
Explanation:numbers are of 4-digits > 990 and < 5000
thousand place can be filled by 4 only in one way
as repetition is allowed , rest three places can be filled in 6 ways each
total no. formed = 1*6*6*6 = 216
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L&T Infotech Huawei
14. A clock is set at 5 a.m. The clock loses 16 minutes in 24 hours. What will be the true time when the clock indicates 10 p.m. on 4th day?
Answer:
Explanation:As the clock loses 16minutes in 24 hours, so in 1 hour it loses 16/24hrs i.e. 2/3 hrs.
From the 1st day(5am) to 4th day(5 am) it will lose 16x3=48mins.
On the 4th day there is 17 hrs from 5am to 10pm i.e. equal to 17 hrs.
So in 17 hrs the clock will lose 17x(2/3)= 34/3= 11mins 20 seconds
So total minutes the clock has lost is 48mins+11mins 20 seconds= 59 mins 2 seconds = 1 hour (appx.)
So the true time will be 10+1= 11pm
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L&T Infotech
15. When a stone is dropped from a building 200 m high, its speed is proportional to the time elapsed after dropping. The distance traveled is proportional to the square of the time elapsed. After 1 second the speed of the train was 10 m/sec and it was 190 m above the ground. When its speed is 25 m/sec, what would be its distance from the ground?
Answer:
Explanation:v= x*t and s= y*t^2
10 = x*1, hence x=10 units
(200-190) = y*1*1
y=10
When speed = 25m/sec, time elapsed = 25/10 = 2.5 sec
Distance travelled by stone = 10*(2.5)^2 = 62.5 mts
So, distance of stone above ground = 200-62.5 = 137.5 mtrs
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L&T Infotech Huawei
16. A man and a woman, walking together start out by both taking a step with the left foot. In order to keep together, the man whose stride is longer, takes two steps while the woman takes three. How many steps will the woman have taken they are both about to step out on the right foot for the first time together?
Answer:
Explanation:Five steps excluding starting left foot.
first man left and right, in that time woman has to do left,right and left.
Man and woman are ends with left and left.
Next man left and right again, but woman has to start with right step. right,left,right. man and woman ends with right and right now.
Hence solution is five.
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L&T Infotech
17. Which of the choices is true for the mentioned declaration?
const char *p;
and
char * const p;
Choose one of them:
Answer: In first case, you can't change the character and second case you can’t change the pointer
Explanation:Here is no explanation for this answer
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