Explanation

Convert minutes to seconds:

5 minutes = 5 × 60 = 300 seconds

Ratio = 300 seconds : 180 seconds

= 5:3

Explanation

Any sloping line is called diagonal.

A quadrilateral has two diagonals.

Explanation

To evaluate this expression, we need to follow the order of operations (PEMDAS):

• Multiply 2 and 25: 2 × 25 = 50
• Divide 50 by 5: 50 ÷ 5 = 10
• Add 10: 10 + 10 = 20
• Subtract 2: 20 - 2 = 18

So, the correct answer is: 18

Explanation

27 – 21 = √?  + 1

6 = √25 + 1

6 = 5 + 1

6 = 6

Explanation

Given ratio: 50 paisa:1 rupee:2 rupee = 2:5:8

Let's assume the number of coins of each denomination are:

50 paisa = 2x

1 rupee = 5x

2 rupee = 8x

Total amount = Rs. 352

The value of coins is:

50 paisa coins = 2x * 0.50 = Rs. x

1 rupee coins = 5x * 1.00 = Rs. 5x

2 rupee coins = 8x * 2.00 = Rs. 16x

Adding these values, we get:

x + 5x + 16x = 352

Combine like terms:

22x = 352

Divide by 22:

x = 16

Now, find the total number of coins:

50 paisa coins = 2x = 2(16) = 32

1 rupee coins = 5x = 5(16) = 80

2 rupee coins = 8x = 8(16) = 128

Total number of coins = 32 + 80 + 128 = 240

So, the correct answer is: 240