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(a) 3 groups of 7 = 21

Answer: 21 ships

 

(b) At the odd number seconds –> multiples of 7

Number of groups of 7 –> the number of the next second divided by 2

Examples: 3rd second à 4 ÷ 2 = 2, 2 groups of 7

                    5th second à 6 ÷ 2 = 3, 3 groups of 7

 

At the even number seconds –> the number of ships for the previous second + 5

Examples: 4th second –> 2 groups of 7 + 5 = 19

                    6th second –> 3 groups of 7 + 5 = 26

 

124 is not a multiple of 7, therefore the number belongs to an even number second.

(124 – 5) ÷ 7 = 17

17 x 2 = 34

Answer: 34 seconds

 

(c)  1 min = 60 seconds

            60 ÷ 2 x 7 + 5 = 215

Answer: 215

 

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