Math

Q.250 cm3(cube) of the liquid weighs 125 grams. find the weight of 1000 cm3(cube) of the liquid.

Q.The cost of a long distance call lasting 20 seconds was 23.40 at this rate what was the cost of a call lasting 6 minutes 30 seconds.

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  1. #1
    to get this, we just use ratio and proportion.
    let x = weight of 1000 cm^3 liquid.
    250 cm^3 : 125 g = 1000 cm^3 : x g
    thus we can rewrite this as,
    250/125 = 1000/x
    solving for x,
    2 = 1000/x
    2x = 1000
    x = 500 grams

    #2
    here, we also use ratio and proportion. first we convert 6 min and 30 seconds to seconds:
    6 min = 360 seconds
    thus 360 + 30 = 390 seconds
    let x = cost of 390 second call
    20 : 23.4 = 390 : x
    thus,
    20/23.4 = 390/x
    0.855 = 390/x
    x = 390/0.855
    x = 456.3

    hope this helps~ :)

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    posted by Jai

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