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Ok, this is my first post. I'm not too sure if there'd be anything wrong with this post. I'd appreciate it if you guys tell me if I CAN'T do something I already did in this forum. Getting to the questions. I've tried them but got different answers. I couldn't find any explanations for them so needed some help. 1. A card game was being played by 3 teams with 3 members each. Each member had to lift a card numbered from Ace to 9. A team earned one point for picking up an Ace, 2 for picking up a card numbered 2 and so on. Scores of 0 were allotted for cards numbered 6,7,8 and 9. If no team earned more than 6 points and if a card picked by a team was not replaced, what is the least possible score a team could earn? 1) 0 2) 1 3) 2 4) 3 5) 4 2. At Big Inc, the board meets once every 60 days and the council meets once every 25 days. If a year consists of 300 working days, the number of board meetings in a year is what percent less than the number of council meetings in a year? 1) 34 2) 42 3) 58 4) 71 5) 86 3. The average life expectancy in three countries A,B and C was 75, 90 and 80 years, respectively. The ratio of population in the three countries was 4:2:3 respectively. What was the average life expectancy of the three countries combined? 1) 75 2) 80 3) 81 4) 92 5) Can't find with info given Update: Figured the 3rd one out!

How many liters of pure alcohol must be added to a 100-liter solution that is 20% alcohol in order to produce a solution that is 25% alcohol? A. 7/2 B. 5 C. 20/3 D. 8 E. 39/4

A jar contains a mixture of two liquids A and B in the ratio 4:1. When 10L of the mixture is replaced with liquid B, the ratio becomes 2:3. How many litres of liquid A was present in the jar earlier? Answer with explanation please