Posted by D on Tuesday, September 13, 2011 at 7:33pm.
17 boys do not know how to swim. Therefore, 17 boys do swim.
100 - 34 = 66 girls
2/3 * 66 = 132/3 = 44
44 + 17 = ?
Easy. Ok
"Half the boys said....yes" which means half said no. 17 said no so that means 17 out of 34 boys know to swim. Now for the girls, we know there are 34 boys so that leaves 66 girls total. 66 multiplied by 2/3 is 44. (44 girls said yes.) 44+34= 78.
Therefore 78 seventh graders know how to swim
(actually sorry, it's 17+44, I made a mistake. That is equal to 61)
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