Help with a math question?

Question

A piece of wire 7.3 centimeters long weighs 86 grams. What will a 20-centimeter length of the same wire weigh? (Round to the nearest hundredth)

I did 86/7.3 = 11.78 * 20 = 235.6g

is that right? I have no clue.

Answer 1

its correct

Answer 2

do a proportion     7.3/86= 20/x     cross multiply, then solve

Answer 3

Yes, you are absolutely correct.

Answer 4

1)

86 g/7.3 cm

= 11.780821917... g/cm

≈ 11.78 g/cm

11.78 g/cm * 20 cm

= 235.6 g

= = = = = = = =

2)

9.8/100 x 100%

= 980/100 %

= 9.8%

Answer 5

I believe that's correct.  I thought of it as units first and then try to fill in the numbers.  So by doing it that way, you start with weight and then find the weight/length ratio by dividing by the length and then multiply by the new length like this:

(weight) * (1 / length) * (new length) = new weight

that way the units for length cancel to leave you with weight and you substitute the numbers in as you've done.  great job!

Answer 6

perfect working!

86/7.3  finds weight of 1 cm

11.78 * 20 = 235.6g  = weight of 20cm

Answer 7

RIGHT.......

Answer 8

actually, you're answer is already right...

(@^_^@)