more math questions

[issa]

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the average of 3 lbs 2 oz, 4 lbs 6 oz, and 9 lbs 10 oz =??

A+B= .75C
C+A=.8B
what % of C=1.5B


5 consecutive whole numbers sum = 50
what is the 2nd number of the 5?

 

[Arsenalista]

5 consecutive whole numbers sum = 50
what is the 2nd number of the 5?

n, n+1, n+2, n+3, n+4 = 50
5n+10 = 50
5n = 40
n=8
2nd number ---> n+1=9

 

[tinman831]

the average of 3 lbs 2 oz, 4 lbs 6 oz, and 9 lbs 10 oz =??

A+B= .75C
C+A=.8B
what % of C=1.5B


5 consecutive whole numbers sum = 50
what is the 2nd number of the 5?

3lbs 2oz = 50oz
4lbs 6oz = 70oz
9lbs 10oz = 154oz
(50 + 70 + 154) / 3 = 91.3333 oz which is about 5lbs 11oz

C+A=.8B so C = .8B-A
A+B=.75C so plug in for C... A+B = .75(.8B-A) so A+B = .6B - .75A
A+B = .6B - .75A is the same as 1.75A=-.4B.... A=-.4B/1.75

since C=.8B-A then C= .8B-(-.4B/1.75) = 1.8B/1.75

1.5B/(1.8B/1.75) = 1.458 = 145.8% I THINK 😕

 

[joonkimdds]

A+B= .75C
C+A=.8B
what % of C=1.5B

A+B=0.75C
-[A-0.8B=-1C]
---------------
1.8B=1.75C
thus B = (1.75/1.8)C


what % of C = 1.5B?
1C = 1.5(1.75/1.8)C is
1C = 1.458333C

(1.458333C / 1C) * 100 = what %
there fore 145.83% is the answer.

 

[keibee82]

omg we have to know how many oz are in a lbs and stuff like that?
do we need to know other conversion factors too? like F to C temp?

 

[joonkimdds]

omg we have to know how many oz are in a lbs and stuff like that?
do we need to know other conversion factors too? like F to C temp?

3.7, 3.9 GPA person just freaked out 😱
I think u should know the conversion between C and F for science section anyway.