A square box is filled with two layers of identical square pieces of chocolate. Kirill has eaten all 20 pieces in the upper layer, which are along the walls of the box. How many pieces of chocolate are left in the box ?IKMC Grade 1 - 2
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A bus left its terminal with 18 commuters. 4 commuters alighted from the bus at the second stop. At the same stop, 8 commuters boarded the bus. How many commuters were on the bus after the second stop ?
Trains leave a station every 40 minutes. At what time would the third train leave the station if the first train left at 6:30 am ?