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Of the staff in an office, 15 rode a pushbike to work on Monday, 12 rode on Tuesday and 9 rode on Wednesday. If 22 staff rode a pushbike to work at least once during these three days, what is the maximum number of staff who could have ridden a pushbike to work on all three days?

 Nov 29, 2019
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Let the maximum number of people who rode the bike all 3 days =S
S + (15 - S) + (12 - S) + (9 - S) = 22
-2S + 36 = 22
-2S = 22 - 36
-2S = -14
S = -14 / -2

S = 7 - Maximum number of people.

 Nov 29, 2019

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