Percentage correct = (90 / 120) * 100 = 75%.

Incorrect answers = 120 - 90 = 30. Percentage incorrect = (30/120) * 100 = 25%.

The number of questions answered correctly is 90% of 200, which is 180. Therefore, the number of questions answered incorrectly is 200 - 180 = 20.

If 90% were answered correctly, then 10% were answered incorrectly. Therefore, the number of incorrect answers is 10% of 200, which is 20.

The number of ways to choose 2 subjects from 5 is 5C2 = 10.

The number of ways to choose 2 subjects from 5 is given by 5C2 = 10.

Average percentage = (75% + 85%) / 2 = 80%.

Percentage score = (90/120) * 100 = 75%.

The formula for simple interest is A = P(1 + rt). If the amount doubles, A = 2P. Therefore, 2P = P(1 + r*5). Simplifying gives r = 0.1 or 10%.

The formula for simple interest is A = P(1 + rt). If the amount doubles, A = 2P. Therefore, 2P = P(1 + r*5). Simplifying gives r = 0.1 or 10%.

Using the formula for simple interest, SI = PRT, where SI = Principal, R = Rate, and T = Time. If the principal doubles in 5 years, then SI = P. Therefore, P = PRT implies R = 1/5 = 20%. Hence, the rate of interest is 10%.

Using the formula for simple interest, we know that the interest earned is equal to the principal. Therefore, if the principal doubles in 5 years, the rate of interest can be calculated as (100 * Interest) / (Principal * Time) = (100 * Principal) / (Principal * 5) = 20%. Thus, the rate of interest is 20%.

Using the rule of 72, we estimate the time to double as 72/12 = 6 years.

Using A = P(1 + r)^t, A = 1000(1 + 0.06)^5 = 1000 * 1.338225 = 1338.23.

Using the formula A = P(1 + rt), we have 3P = P(1 + 0.06t). Solving gives t = 20 years.

Using SI = PRT, SI = 8000 * 0.06 * 4 = $1920.

If the sum triples, the interest earned is 2P in 15 years. Thus, 2P = PRT implies R = 2/15 = 13.33%, which is approximately 6.67%.

Using the formula A = P(1 + r)^t, A = 1200(1 + 0.05)^3 = 1200 * 1.157625 = 1389.15.

The number of ways to choose 4 players from 10 is given by 10C4 = 210.

The number of ways to choose 4 players from 8 is given by 8C4 = 70.

The number of ways to choose 5 players from 10 is given by 10C5 = 252.

Let the cost price be x. Selling Price = x - 15% of x = 255. Thus, 0.85x = 255, so x = $300.

This triangle satisfies the Pythagorean theorem (5² + 12² = 13²), thus it is a right triangle.

a * b ≡ 2 * 1 ≡ 2 (mod 3).

a * b ≡ 2 * 3 ≡ 6 (mod 5), which is equivalent to 1.

a + b ≡ 3 + 5 ≡ 8 ≡ 1 (mod 7).

All operations (addition, multiplication, and subtraction) preserve congruence in modular arithmetic.

All operations (addition, subtraction, multiplication) maintain congruence under modular arithmetic.

Let angle B be x. Then angle A = 3x. Since they are supplementary, x + 3x = 180, leading to 4x = 180, so x = 45. Therefore, angle A = 3 * 45 = 135 degrees.

Supplementary angles sum up to 180 degrees. Therefore, angle B = 180 - 45 = 135 degrees.