ANSWER : 16 2/3

Explanation : : Alcohol in the mixture = 1/ 1+4 x 15 =1/5 x 15 =3 litres Water =15 -3 =12 litres If 3 litres added then total mixture =15+3=18 litres % of Alcohol in the new mixture = 3/18 x 100 =100/6=16 2/3 %

ANSWER : Loss percent 1 19/81 %

Explanation : : Let the equal number of oranges be x Then the total cost price =10/4x+10/5x =50x+40x / 20=90x /20=9x/2 Total selling price = 20/9 x 2x=40x/9 Loss =9x/2-40x/2=81x-80x / 18 =x/18 Loss percent = Loss / Cost Price x 100 = (x/18) / (9x/2) x 100 =1/81 x 100 =1 19/18 %

ANSWER : 50

Explanation : : Let the average in 10 tests be x Total runs in 10 tests = 10 x Total runs in 11 tests = 10x + 100 Average in 11 tests = 10x + 100/11=x+5 =10x+100=11x + 55 x=100-55=45 Present average = x + 5 =45 + 5 =50

ANSWER : Rs 65

Explanation : : A+B=3(B+C)...(1) A+B+C=A+30---(2) B=5C---(3) From (2) A+B+C=A+30 B+C=30 But B=5C =5C+C=30 6C=30 C=30/6=5 Now B+C=30 B+5=30 B=30-5=25 (1)=A+B=3(B+C) A+25=3 x 3 =90 A=90-25=65

ANSWER : 2200

Explanation : : Let the monthly incomes of A and B be 6x and 5x respectively Now income-Saving=Expenditure 6x-400 / 5x-400 = 4/3 =18x-1200=20x-1600 =2x=400 x=200 Sum of the incomes 6x+5x=11x=11 x 200 =Rs.2200