Mixed Quantitative Aptitude Questions Set 187

1. Three numbers in the ratio of 1: 2: 3 and their L.C.M is 120. Find their H.C.F?
   10
   15
   20
   25
   30
   Option C
   Let the number be x, 2x,3x. So H.C.F is x. L.C.M of x, 2x, 3x= 6x.
   6x =120 => x= 20.
   
   
    



2. The ratio between two number is 6:5 if their HCF is 10. Then the numbers are.
   10,20
   60,50
   20,60
   20,50
   40,50
   Option B
   Let the number be 6x, 5x
   HCF of 6x,5x=x
   ie) x=10(given)
   Then the numbers are 6x,5x=60,50
   
   
    



3. Find the average of first 14 natural number.
   100
   105
   200
   205
   300
   Option B
   average of first n natural number=n(n+1)/2
   here n=14
   average=14(14+1)/2=7x15=105
   
   
    



4. The sum of ages of three sister born of the intervals of 2 years each is 42 years. What is the age of the youngest sister ?
   10
   11
   12
   13
   14
   Option C
   x+(x+2)+(x+4)=42 (given the intervals are 2 years)
   3x+6=42  x =36/2=12
    Age of the youngest sister=12 years
   
   
    



5. Cost of a mobile is Rs .5000 and selling price is Rs. 7000.What is the profit percent?
   20
   30
   40
   50
   60
   Option C
   Profit % = p/c.p x 100
   =2000/5000 x 100
   P%=40
   
   
    



6. Ganesh can do a task in 4days . Prem can do a task in 3 days. How long if will take if both Ganesh & Prem work together?
   1 d 5 hr
   2 d 5 hr
   5 d 2 hr
   4d 6hr
   2 d 6 hr
   Option A
   Ganesh 1day work=1/4
   Prem 1day work =1/3
   (Ganesh+Prem) =1/4+1/3=7/12
   So Ganesh& Prem will complete in 12/7=1 5/7=1day 5hrs together.
   
   
    



7. If a boat travels with a speed 25km/hr in still water and the speed of stream is 5km/hrs . What would be the time taken by boat to go 40 km upstream?
   2
   3
   4
   5
   6
   Option A
   Upstream speed = x-y km/hr
   =25-5=20 km/hr
   T=distance/speed
   T=40/20=2hrs
   
   
    



8. What is the simple interest on Rs 60000 at 5 ½% per annum for 2 years?
   4300
   5500
   6600
   4400
   5500
   Option C
   S.I = P X R X T/100=60000 x 5 ½ x 2/ 100
   S.I=Rs 6600
   
   
    



9. Ram deposits Rs .20,000 for 2years with 5% compound interest. What amount will be get at last?
   Rs .22050
   Rs .32050
   Rs .52050
   Rs .20050
   Rs .12050
   Option A
   Amount= P x (1+r/100)n
   =20000 X (1+5/100)2
   =20000 x 105/100)2
   =20000x 105x105/10000
   =Rs .22050
   
   
    



10. A florist choose one rose at random from the basket which have rainbow colors of roses. what is the probability of choosing yellow color rose?
    1/7
    1/5
    1/4
    1/3
    1/2
    Option A
    S=(rainbow color roses)
    S=(V,I,B,G,Y,O,R)=N(S)=7
    P(Yellow rose)=P(S)/N(S)=1/7 (Only one yellow rose)