Question
There are 15 numbers such that average of first 12
numbers is 20 while the average of last five numbers is 40. Find the 12th number, if the ratio between 11th and 12th number is 9:7, respectively.Solution
Sum of first 12 numbers = (12 x 20) = 240 Sum of last 5 numbers = (40 x 5) = 200 Sum of 11th and 12th number = (240 - 200) = 40 So, 12th number = 40 x (7/16) = 17.5
- Kiran shared 288 toffees among his three friends Sonu, Monu and Tanu in the ratio 2:3:7 respectively. Find how many more toffees Tanu received than Sonu.
The ratio of prices listed for a bag and that of a belt is 2:1. In a sale, there was a discount of 40% on the belt. At the time of checkout, Ankit notic...
Total population of city P and Q is 2720 and 3300 respectively. If the ratio of number of males to females in city is P and Q is 5:3 and 3:2 respectivel...
The ratio of A's income to savings is 25:9, and B's expenditure is 60% of A's total income. If B's expenditure exceeds its savings by Rs. 3500, and A's ...
The average mark obtained by 150 candidates in a certain examination is 45. If the average marks of passed candidates are 55 and that of the failed cand...
- Four friends ('W', 'X', 'Y', and 'Z') went to dinner and received a bill of Rs. 1,800. They agreed that 'W' would pay half of what the other three paid tog...
If A: B = 2:3 and B: C = 3:4 find the value of (A+B): (B+C): (C+A).
The incomes of A and B are in the ratio of 3:2 and their expenditures are Rs. 14,000 and Rs. 10,000 respectively. If A saves Rs. 7000, then B's savings ...
Rohit, Manish, Suresh, and Arjun were playing a football match. The ratio of goals scored by Rohit and Manish was 6:9 respectively, while that between M...
Difference between the ages of A and B is same as the difference between the ages of B and C. The difference between the ages of A and C is 8 years. If ...
