posted by .

I thought it was similar so I wrote...

x + y = 30cm^3
x + 2y = 61.5cm^3
2x + 2y =60cm^3
x + 2y = 61.5cm^3
x= -1.5cm^3(volume of methane)
y= {61.5-(-1.5)}/2= 31.5cm^3(volume of ethane)

However my teacher said the volume i got for ethane is wrong, because my second equation(x+2y) should not be equal to 61.5cm^3.... so this is why I am lost. I tried to follow your previous example though. So I need your help again.

As a hint she she gave us this...
61.5cm^3- (A + 2B)= 100- (2A+ 3 and a 1/2B)...I have no idea what this is.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Geometry

    Find the surface area for each of the following Rt. Square Pyramid 6.5cm 2.5cm,2.5cm
  2. geometry regular polygon

    a=? s=10.5cm A= 19,887.5cm squared Pentagon A=asn/2 19,887.5cm=a*10.5*5/2 39775=52.5a a=757.61cm?
  3. Physics

    A 395cm oscillator has a speed of 104.5cm/s when its displacement is 2.80cm and 74.5cm/s when its displacement is 6.60cm. What is the oscillator's maximum speed?
  4. math

    micheal drew a triangle with the sides measuring 12.5cm,30cm,32.5cm. using the pythagoream theorm determine of micheals triangle is a right triangle. explain. PLEASE HELP ME WITH THIS ONE!!

    30cm^3 of a mixture of methane and ethane were mixed with 100cm^3 of oxygen at ordinary temperature and pressure and exploded. After cooling the residual gases occupied 61.5cm^3. Find the percentage by volume of each gas in the mixture, …
  6. Physics

    A 492g oscillator has a speed of 99.5cm/s when its displacement is 3.60cm and 72.5cm/s when its displacement is 5.10cm . What is the oscillator's maximum speed?
  7. a

    A rectangle is 3times as long as it is wide the perimeter is 60cm. Find the dimensions of the rectangle round to nearest tenth if necessary answers are 7.5cm.by22.5cm., 7.5cm.by52.5cm., 20cm.by60cm., 15cm.by22.5cm thanks
  8. maths

    A carton of dimension 30cm by 15cm by10cm is used to store match boxes of dimension 5cm by 3cm by 2cm. a) using a scale of 1cm to 5cm, draw the net of the carton b) make a real model c) determine the volume of the carton, the total …
  9. math

    the external dimensions of a closed box are 8cm by 5cm by 4cm. given that the thickness of the wood of which it is made is 0.5cm, find the volume of the wood used to make it.
  10. asthmatics

    Find the volume of the wood required to make an open box of internal dimensions 20cm by 12.5cm by 9.5 cm.the wood being 1.5cm thick.

More Similar Questions