Thenmalar appeared for competitive exam which has negative scoring of 1 mark for each incorrect answer. In paper I she answered 25 questions incorrectly and in paper II, 13 questions incorrectly. Find the total reduction of marks.

Are (11 + 7) + 10 and 11 + (7 + 10) equal? Mention the property.

A lift is on the ground floor. If it goes 5 floors down and then moves up to 10 floors from there. Then in which floor will the lift be?

What number should be added to (–17) to get (–19)?

What will be the sign of the product of the following.
(i) 16 times of negative integer.
(ii) 29 times of negative integer