Math
posted by D on .
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?

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)

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. 
Half the boys said yes so that means 17 boys said no. 17+17= 34 boys. 100 students minus 34 boys equals 66 girls. Now, 2/3 of 66 is 44 because 22 times 3= 66. So that means that 44 girls said yes and 17 boys said yes so 44+17= 61 seventh graders that know how to swim.