help! :)

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Jenny surveyed 40 students at her school and found that 0.55 of the students she surveyed said their favorite class is math. Another 25% of the students she surveyed reported that their favorite class is science. How many more students in the survey prefer math over science? 12 22 30 32
not sure

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Other answers:

okay
i got c?
I prefer to work it out and not deflate the value of the answer by choosing the letters, which have nothing to do with math. So let's work out the problem. How many like math, and how many like science?
  • phi
40 students at her school and found that 0.55 of the students like math can you find how many like math ? (I would multiply 0.55 and 40)
  • phi
they are saying 55% of 40 like math. How many is that ?
i got 22
  • phi
yes, then they say 25% of 40 like science. how many is that ?
ummmm i dont know... is it like 20?
  • phi
25% of 40 means multiply \[ \frac{25}{100} \cdot 40\]
10
  • phi
How many more students prefer math over science? any idea ?
5?
  • phi
they are asking if 22 like math and 10 like science, how many more like math than science? do you know how to figure that out ?
no
  • phi
to find how much bigger a number is from another number, subtract big number minus small number
12
  • phi
yes. 12 is the answer.
okay thanks :)
Ronny, Celina, Jack, and Michelle together placed a total of 20 brownies on a tray. Ronny placed 0.15 of the brownies, Celina placed 3 of the 20 brownies, Jack placed 30% of the brownies, and Michelle placed the remaining brownies. Who placed the most brownies? Ronny Celina Jack Michelle
  • phi
total of 20 brownies Ronny placed 0.15 of the brownies, how many is that ? how would you figure it out ?
how do i solve that
  • phi
0.15 of 20 brownies, 0.15 of 20 that means 0.15 times 20
10
  • phi
0.15*20 is not 10
3
  • phi
yes. so Ronny put down 3 brownies. they say Celina placed 3 Jack placed 30% of the brownies, how do you figure out how many Jack placed?
um.. 0.30 * 3?
  • phi
close. 0.30 of 20
so 0.30 *20
  • phi
yes
6
  • phi
so far we know Ronny put down 3 brownies. Celina placed 3 Jack put 6 how many is that all together ?
9
  • phi
try again. Ronny 3, Celine 3, Jack 6
15
  • phi
what is 3+3+6?
12
  • phi
Michelle placed the remaining brownies if the other people put 12, how many did Michelle put (so that we get 20) ? know how to figure that out?
8?
  • phi
yes. Michelle put 8 so now we know Ronny put 3. Celina put 3 Jack put 6 Michelle put 8 who put the most?
michelle
  • phi
that is the answer

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