Indian Mathematical Puzzles

12 + 6 + 8 = 36

The relative speed of the two trains is 70 + 60 = 130 km/h. The time taken for the two trains to meet is 1300 / 130 = 10 hours. Since the second train leaves at 11:00 AM, the two trains will meet at 11:00 AM + 10 hours = 3:30 PM.

Let the cost price of the shirt be ($x). Then, the profit is ($20 - $x). Since the profit is 20% of the cost price, we have ($20 - $x) = 0.2 ($x). Solving for ($x), we get ($x) = ($16).

The area of the garden is (20 \times 15 = 300) square meters.

60% of 1000 liters is (0.6 \times 1000 = 600) liters.

The average speed of the train is (300 \div 5 = 60) km/h.

Let the cost price of the product be ($x). Then, the profit is ($10 - $x). Since the profit is 25% of the cost price, we have ($10 - $x) = 0.25 ($x). Solving for ($x), we get ($x) = ($8).

The perimeter of the room is (2 \times (12 + 8) = 40) meters.

75% of 2000 liters is (0.75 \times 2000 = 1500) liters.

The average speed of the train is (400 \div 6 = 60) km/h.

Let the cost price of the product be ($x). Then, the profit is ($12 - $x). Since the profit is 30% of the cost price, we have ($12 - $x) = 0.3 ($x). Solving for ($x), we get ($x) = ($9).

The area of the room is (15 \times 10 = 150) square meters.

80% of 3000 liters is (0.8 \times 3000 = 2400) liters.

The average speed of the train is (500 \div 7 = 70) km/h.

Let the cost price of the product be ($x). Then, the profit is ($15 - $x). Since the profit is 35% of the cost price, we have ($15 - $x) = 0.35 ($x). Solving for ($x), we get ($x) = ($11).