ANSWER : 3:5

Explanation : : A type fertilizer =2x b type fertilizer=5x 2x+5x=7x-21 x=21/7=3 kg A type fertilizer=2x=2x3=6kg B type fertilizer=5x=5x3=15 kg If 3 kg of A is added, A type fertilizer=6+3=9 kg Ratio of A to B=9/15=3/15 (or) 3:5

ANSWER : 9:11

Explanation : : Milk=1/3,2/5,3/5,7/15 Water=2/3,3/5,2/5,8/15 Equal quantities of milk=5/15,6/15,9/15,7/15 Equal quantities of water=10/15,9/15,6/15,8/15 The ratio of milk and water in the new solution 5/15 + 6/15 + 9/15 + 7/15 / 10/15 + 9/15 + 6/15 + 8/15=27/15 / 33/15=27:33=9:11

ANSWER : 36 years and 52 years

Explanation : : The present age of A and B is x and y 4 years ago, x-4/y-4=2/3=>3x-12=2y-8 =>3x-2y=+4-->(1) eqn 4 years hence, x+4/y+4=5/7=>7x+28=5y+20 =>7x-5x=-8-->(2) eqn We solve the equation (1) and (2) we get x=36 years y=52 years

ANSWER : 595

Explanation : : The number are 10x,7x Difference(10x-7x)=105 3x=105=>x=105/3=35 The numbers are 10x35,7x35 i.e 350,245 The sum of the numbers =350+245=595

ANSWER : 16:15

Explanation : : The sum at 5% rate =Rs.x The sum at 8% rate=Rs(1550-x) According to this question, SI=PxRxN/100 X x 5 x 3/100 + (1550-x)x8x3/100=300 15x+1550x24-24x/100=300 15x+37200-24x=30000 9x=7200 x=7200/9 =Rs.800 The other part of sum=Rs.1550-Rs.800 =Rs.750 The ratio of the money lent at 5% to that lent at 8% is =800/750=16/15 (or) 16:15