Posted by D on Tuesday, September 13, 2011 at 7:33pm.
Ms. Poole, my PE teacher, asked the 100 seventh in my school if they could swim. Half the boys and two thirds of the girls said yes. Seventeen boys said no. How many seventh graders know how to swim?

Math  Ms. Sue, Tuesday, September 13, 2011 at 7:38pm
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 = ?

Math  Daniel, Tuesday, September 13, 2011 at 7:42pm
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

Math  Daniel, Tuesday, September 13, 2011 at 7:44pm
(actually sorry, it's 17+44, I made a mistake. That is equal to 61)

Math  ?, Monday, October 28, 2013 at 11:49pm
Half the boys said yes so half said yes. 17 boys said no so the other half said yes so 17 boys said yes. 17 + 17 = 34 boys total. Now 100 students take away 34 boys (students) which now leaves 66 students (girls) total.
now 2/3 of 66 is 44 because 22 times 3 = 66. so Now 44 girls said yes and 17 boys said yes so 44 + 17 = 61 seventh graders know how to swim.
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