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Ann goes swimming regularly. She wants to Improve her fitness, 30 she decides to swim ...

Ann goes swimming regularly. She wants to Improve her fitness, 30 she decides to swim 10 lengths in the first session and increase the number of lengths she swims by 2 every session. When she reaches 50
lengths in a session she will not increase the number any further. If Ann asks her friend Joy to come swimming with her. Joy starts coming at Sue's 5th session. Joy starts to swim 15 lengths and increases the number of the lengths hy 5 each time. After how many of Joy's sessions does she swim the same number of lengths as Ann?

A. 10
B. 5
C. 11
D. 4




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