A resolution before a society's managing committee needs the support of at least 60% of the 47 members present. What is the least number of members who must support it?

60% of 47 = 28.2, and members come in whole numbers only, so the count must be rounded UP: 29. Test the neighbours - 28/47 = 59.57%, which is below the 60% floor, while 29/47 = 61.7%, which clears it. 28.2 is the arithmetic answer but not a possible number of members. 28 is the usual slip of rounding to the nearest whole number when the rule says 'at least'. 30 overshoots to the next round figure.