Arithmetic

The largest four-digit even number is 9998. To find the sum of the digits, we add each digit together:

9 + 9 + 9 + 8 = 35

Therefore, the sum of the digits in the largest four-digit even number is 35.

The cost for 31 dictionaries can be calculated by multiplying the cost of one dictionary by the number of dictionaries.

Cost of 31 dictionaries = Cost of one dictionary × 31

Cost of 31 dictionaries = ₹ 162 × 31

Cost of 31 dictionaries = ₹ 5,022

Therefore, ₹ 5,022 must be paid for 31 dictionaries.

To find the total length of both ribbons, we need to add the length of ribbon A and ribbon B.

Length of ribbon A = 96 cm

Length of ribbon B = 78 cm

Total length = 96 cm + 78 cm = 174 cm

Answer: The total length of both ribbons is 174 cm.

To calculate 0.003 * 0.002 / 0.12, follow these steps:

1. Multiply 0.003 by 0.002:
• 0.003 * 0.002 = 0.000006
2. Divide the result by 0.12:
• 0.000006 / 0.12 = 0.00005

Therefore, 0.003 * 0.002 / 0.12 = 0.00005

Let's solve for the missing number:

3004 + 9873 – 1951 - ? = 35873

First, combine the known numbers on the left side:

12877 - 1951 - ? = 35873

10926 - ? = 35873

Now, isolate the unknown by subtracting 10926 from both sides:

- ? = 35873 - 10926

- ? = 24947

Multiply both sides by -1 to solve for ?:

? = -24947

Therefore, the missing number is -24947.