When multiplying decimals, multiply the numbers as integers (7 * 6 = 42) and then place the decimal point so the result has the same number of decimal places as the sum of the decimal places in the factors (1 + 1 = 2). Thus, 0.42.

To find the missing value, divide 3.2 by 12.8. 3.2 / 12.8 is equivalent to 32 / 128. Simplifying the fraction 32/128 gives 1/4, which is equal to 0.25.

1.8 × 1.5 = 2.7. Multiply ignoring decimals: 18 × 15 = 270. Since there are 2 decimal places total (1 in each number), place the decimal point to get 2.70 or simply 2.7.

8 hours = 28,800 seconds (8 x 60 x 60). The fraction is 120/28,800 = 1/240. This is a simple ratio calculation - 120 seconds out of the total seconds in 8 hours. Option A correctly shows 1/240 sec as the unit ratio representation.

Let x be the number to add. New average = (6 + 16 + 8 + x)/4 = 13. Therefore: 30 + x = 52, so x = 22. Adding 22 to the sum of 30 gives 52, which divided by 4 equals 13. This is a basic average problem - find the missing value that achieves a target mean.

Let the number be x. According to the problem: 4x + 10 = 5x - 5. Solving: 10 + 5 = 5x - 4x, so 15 = x. Therefore the number is 15. Option A is correct.

One hour = 60 minutes. The ratio of 12 minutes to 60 minutes is 12:60, which simplifies to 1:5 by dividing both terms by 12. Option A is correct.

The pattern is: each term equals the previous term plus consecutive powers of 2. 2+1=3, 3+2=5, 5+4=9, 9+8=17. The next term is 17+16=33. Option A is correct.

This series follows a clear pattern: each number decreases by 6 (58→52→46→40→34). To continue the pattern, subtract 6 from 34 to get 28. This is a simple arithmetic progression with a constant difference of -6.

This series alternates between two patterns: add 1, then add 3. Starting from 3: 3+1=4, 4+3=7, 7+1=8, 8+3=11, 11+1=12. Following this pattern, add 3 to 12 to get 15.

This series alternates between the number 8 and an increasing sequence: 8, 22, 8, 28. The second numbers increase by 6 each time (22→28→34). Following the pattern, after 8 comes 34 (28+6).

This series alternates between subtracting 2 and subtracting 5: 31-2=29, 29-5=24, 24-2=22, 22-5=17. Following this pattern, subtract 2 from 17 to get 15. The pattern is -2, -5, -2, -5.

This is an arithmetic progression where each subsequent number is found by adding 0.8 to the previous term. 1.5 + 0.8 = 2.3; 2.3 + 0.8 = 3.1; 3.1 + 0.8 = 3.9. Therefore, 3.9 + 0.8 = 4.7.

The sequence follows an alternating pattern of multiplying by 2 and then subtracting 8. Specifically: 142=28, 28-8=20, 202=40, 40-8=32, 32*2=64. The next step is 64-8, which equals 56.

The pattern increases by adding consecutive integers: 201+1=202, 202+2=204, 204+3=207. The next increment is +4, giving 207+4=211.

Each term decreases by 35: 544-35=509, 509-35=474, 474-35=439. The next term is 439-35=404.

This series consists of two alternating patterns. The first pattern (80, 70, 60) subtracts 10 each time. The second pattern (10, 15, ...) adds 5 each time. Following the second pattern, 15 + 5 equals 20.

This is a geometric progression where each number is multiplied by 3 to get the next number: 2 * 3 = 6; 6 * 3 = 18; 18 * 3 = 54. Therefore, 54 * 3 = 162.

Each term is divided by 5: 1000/5=200, 200/5=40. The next term is 40/5=8.

This pattern alternates symbols with & delimiters. Following the sequence structure, each position maintains a consistent pattern where # and $ alternate. The question mark fills position 11, continuing the established alternating rhythm between symbols.