Math Mania

Which number should replace the question mark in this series: 3, 6, 11, 18, ?:

25 27 28 30

A train travels 120 km in 2 hours. If its speed is reduced by 20 km/h, how long will it take to cover the same distance?:

2 2.5 3 3.5

What is the sum of all angles in a hexagon?:

540° 1080° 720° 360°

What’s the next number in this sequence: 2, 6, 12, 20, 30, ?:

42 36 40 46

If a number is doubled and then reduced by 6, the result is 10. What’s the number?:

6 8 12 10

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