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There are 7 people he wishes to invite. Every friend has 2 choices either accept or decline the invitation. So, total ways = 2*2*2*2*2*2*2 =27 Now, we know 1 or more may accept the invitation(given). So, no person is coming to part = 1 way. So, required ways = 27 – 1 = 128 – 1 = 127
Ratio of runs scored by A, B and C is 3:10:8, respectively. Total number of runs scored by the team is 200, which is four times the runs scored by B. Fi...
The ratio of two numbers is 5:4. A number y is then subtracted from each of the two given numbers so that the ratio of the resultant numbers becomes 2:1...
In an alloy of three metals, ratio of the quantity of gold, silver and platinum is 5:6:8, respectively. If total quantity of silver and platinum togethe...
Total population of city P and Q is 2240 and 2650 respectively. If the ratio of number of males to females in city is P and Q is 4:3 and 3:2 respectivel...
A school has 600 students. The ratio of boys to girls is 3:2. If 40 new boys join the school, what will be the new ratio of boys to girls in the school?
Rs. 1080 was to be distributed between P, Q, and R in the ratio (1/4):(1/6):(1/3), but due to a mistake, it was distributed in the ratio 10:8:6. How muc...
In an orchard, the ratio of the number of mango and lichi trees is 4:7, respectively. Also, there are few apple trees in the orchard which is 50% more t...
In a T20 match, the total runs scored by five batsmen is 400. The ratio of runs scored by Williamson to Taylor is 11:9. If 2/5th of the total runs are s...
