## anonymous one year ago help! :)

1. anonymous

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

2. anonymous

@jcoury

3. anonymous

not sure

4. anonymous

okay

5. anonymous

i got c?

6. mathmate

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?

7. 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)

8. phi

they are saying 55% of 40 like math. How many is that ?

9. anonymous

i got 22

10. phi

yes, then they say 25% of 40 like science. how many is that ?

11. anonymous

ummmm i dont know... is it like 20?

12. phi

25% of 40 means multiply $\frac{25}{100} \cdot 40$

13. anonymous

10

14. phi

How many more students prefer math over science? any idea ?

15. anonymous

5?

16. 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 ?

17. anonymous

no

18. phi

to find how much bigger a number is from another number, subtract big number minus small number

19. anonymous

12

20. phi

21. anonymous

okay thanks :)

22. anonymous

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

23. phi

total of 20 brownies Ronny placed 0.15 of the brownies, how many is that ? how would you figure it out ?

24. anonymous

how do i solve that

25. phi

0.15 of 20 brownies, 0.15 of 20 that means 0.15 times 20

26. anonymous

10

27. phi

0.15*20 is not 10

28. anonymous

3

29. 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?

30. anonymous

um.. 0.30 * 3?

31. phi

close. 0.30 of 20

32. anonymous

so 0.30 *20

33. phi

yes

34. anonymous

6

35. phi

so far we know Ronny put down 3 brownies. Celina placed 3 Jack put 6 how many is that all together ?

36. anonymous

9

37. phi

try again. Ronny 3, Celine 3, Jack 6

38. anonymous

15

39. phi

what is 3+3+6?

40. anonymous

12

41. 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?

42. anonymous

8?

43. 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?

44. anonymous

michelle

45. phi