A. 9
B. 15
C. 25
D. 50
5:x::x:45 x²=45*5 = 225 x=15
Related Mcqs:
- The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is___________?
A. 45
B. 50
C. 51.4 approx.
D. 54.6 approx. - If the arithmetic mean of seventy five numbers is calculated, it is 35. If each number is increased by 5, then mean of new number is___________?
A. 30
B. 40
C. 70
D. 90 - The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is___________?
A. 35.2
B. 36.1
C. 36.5
D. 39.1 - A surn of money is to be distributed among A, B, C, D in the proportion of 5 : 2 : 4 : 3. If C gets Rs. 1000 more than D, what is B’s share ?
A. Rs. 500
B. Rs. 1500
C. Rs. 2000
D. None of these - Find the fourth proportion to 3, 7 and 9.
A. 63
B. 31
C. 21
D. 27 - According to a recipe, 400 grams of flour should be mixed with 500 grams of sugar to bake cookies. If I have only 300 grams of flour, how much sugar should I mix to maintain the same proportion?
A. 360
B. 380
C. 375
D. 400 - Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes?
A. 5/11
B. 6/11
C. 7/11
D. 8/11 - In what proportion must water be added to spirit to gain 20% by selling it at the cost price?
A. 2:5
B. 1:5
C. 3:5
D. 4:5 - In a mixture of milk and water, the proportion of milk by weight was 80%. If, in a 180 gm mixture, 36 gms of pure milk is added, what would be the percentage of milk in the mixture formed?
A. 80%
B. 100%
C. 84%
D. 87.5%
E. None of these - A is a working partner and B is a sleeping partner in the business. A puts in Rs.15000 and B Rs.25000, A receives 10% of the profit for managing the business the rest being divided in proportion of their capitals. Out of a total profit of Rs.9600, money received by A is?
A. Rs.3240
B. Rs.3600
C. Rs.3800
D. Rs.4200
