In a school, the average age of students is 6 years, and the average age of 12 teachers is 40 years. If the average age of the combined group of all the teachers and students is 7 years, then the number of students is:
Q.2
Solve: 2 × 256 × ? = 82 × 102 × 2
Q.3
In a ∆PQR, PS = SR = SQ and ∠PRS = 55°. Find ∠SQP.
Q.4
Solve: 1601 × 198 ÷ 49 – 1399 + 3878 = ?
Q.5
If a square is inscribed in a circle, find the ratio of the area of the circle and the square.
Q.6
Find the result of subtracting the sum of all integers between 10 and 20 from the sum of all integers from 10 to 20.
Q.7
What is the coefficient of x² in the polynomial P(x) = 3x³ + 10(x – x²) – 5x² – 2?
Q.8
The marked price on an item was $3000 but the shopkeeper offered a double discount of 30% and 20%. How much did he finally sell the item?
Q.9
Walking 4/5 of his usual speed, a man is 16 minutes late. Find the usual time taken by him to cover that distance.
Q.10
A fruit seller bought a basket containing 2050 oranges out of which 41 oranges were rotten. What percentage of oranges were rotten?
