I. 3y2 + 16y + 16 = 0 3y2 + 4y + 12y + 16 = 0 y (3 y + 4) + 4(3 y + 4) = 0 (y + 4)(3 y + 4) = 0 y = - 4, -4/3 II. 2x2 + 19x + 45 =0 2x2 + 9x + 10 x + 45 =0 x (2 x + 9) + 5 (2 x + 9) = 0 (x + 5) (2 x + 9) = 0 x = - 5, -9/2 Hence, x > y
The average of 10 numbers is 18. When two new numbers 'a' and 'b' are added, the average increases by 2. If a - b = 30, find the value of b.
Komal bought 20 kg rice for Rs 30 per kg, b kg rice for Rs 35 per kg and (b + 4) kg rice for Rs 25 per kg. She mixed all type of rice together and the a...
The average weight of A, B, C is 76 kg when D joins them the average weight becomes 70 kg. If E whose weight is 2 kg more than D replaces A, then the av...
Average marks scored by Vineet in five subjects are 70. The average marks scored by him (excluding his highest and lowest marks) are 50 and lowest marks...
In a school with 400 students, the average age of the boys is 16 years and that of the girls is 12 years. If the average age of school is 14 years 9 m...
The average age of 13 girls is 40 years. If the age of one more girl is added the average decreases by half a year. What is the age of new girl?
The average expenditure of a man for the first 6 month is Rs.6000 and for the next 6 months is Rs.9000. If he saves 15000 in that year then find his ave...
The average number of books on history, polity and geography in a library is 190, and the average number of books on history and geography is 160. If th...
There are 4 numbers – A, B, C & D. B is 25% more than A and D is equal to average of A & C. Ratio of A to C is 3 : 4 and C is 5 more than B. Find valu...
Average age of 16 students is 18 years. If 4 students leave the class, then the average age decreases by 1.5 years. Find the average age of the students...
