36. The ratio of men athlete to women in an athletic meet is 5 : 3 and the total number of athlete is 2, 400, how many additional women athlete would have to join to make the ratio of men to women 1 : 1 ?
Original number of men;
( 5 / 8 ) x 2, 400 = 1, 500
Original number of women;
( 3 / 8 ) x 2, 400 = 900
To make the number of women equal to the number of men we must add ( 1500 - 900 ).
therefore, 600 women is needed. * Ans.
37. If prices are reduced by 20 %, quantity sold increase by 25 %. What is the net effect on the gross revenue?
Revenue = (price) x (Quantity sold)
Rold = pq
Rnew = (p - 0.20p) x (q x 0.25q)
= (0.80p)(1.25) pq
= (0.80)(1.25) pq
= 1 pq
Rnew = Rold
therefore, the revenue remains the same * Ans.
38. The average of three numbers is xyz. If the sum of two numbers is x + y, what is the other number?
Sum of the items added = average
no. of items added
x + y + (other number) = xyz
x + y + other number = 3 xyz
other number = 3 xyz - (x + y) * Ans.
Civil Service Reviewer Post 101/159