Total number of ribbons = (x + 8) According to question; (xC1 × 5C1)/(x + 8)C2 = 3/11 2 × 5x/(x + 8)(x + 7) = 3/11 110x = 3 × (x2 + 15x + 56) 110x = 3x2 + 45x + 168 3x2 – 65x + 168 = 0 3x2 – 9x – 56x + 168 = 0 3x(x – 3) – 56(x – 3) = 0 (3x – 56)(x – 3) = 0 So, x = 56/3 or x = 3 Since number of ribbons can’t be in fraction Therefore, x = 3
Ratio of the number of pens with Sumit, Rohan, Chetan, Dheeraj and Gagan is 2 : 3 : 4 : 5 : 6 respectively. If two of them have more than 20% of the tot...
Hariom has 85 notes of Rs 50 and Rs 100. If the total money he has is Rs 5000, then find the number of Rs 50 notes.
Ratio of income of A and B is 7:5 and the ratio of expenditure of A and B is 2:3. The savings of B is Rs.3500. If the expenditure of A gets double then...
The ratio of Ankita and Sakshi 's ages will be 9:5 after 16 years. Currently, Ankita's present age is 180% more than Sakshi 's age four years ago. What ...
If A: B = 2:3 and B: C = 3:4 find the value of (A+B): (B+C): (C+A).
A woman distributed her savings between her daughters A, B, C and D in the ratio 6 : 7 : 9 : 16. If A gives Rs. 600 from his share to C, the ratio of sh...
Ram, Laxman, Bharat and Shatrughan purchase a plot for Rs. 54,00,000. The share of Laxman + Bharat + Shatrughan is 440% of Ram and the Share of Ram + B...
The radii of two cylinders are in the ratio 1 : 4 and their heights are in the ratio 4 : 3.
Their volumes will be in the ratio ______.
Solution A contains 10% acid and solution B contains 30% acid. In what ratio should solution A be mixed with Solution B to obtain a mixture with 25% acid?
There are 15 numbers such that average of first 12 numbers is 30 while the average of last five numbers is 50. Find the 12th number, if the ratio betwee...
