Maths

The sum of two numbers is 21 .two-thirds of one number is added to three-quarters of the other number to give 15 .find the two numbers,showing clearly your workings.

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  1. simple translation from English to Math (after all Math is just a language)

    let 1st number be x
    let 2nd number be y

    x + y = 21

    (2/3)x + (3/4)y = 15
    multiply each term by 12
    8x + 9y = 180

    I would use substitution,
    from the 1st equation ----> y = 21-x
    sub that into the 2nd

    go for it, just a few more steps

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  2. are u sure it is substitution or simultaneous equation

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  3. Substitution method

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  4. Wrong equation

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  5. Substitution wrong

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  6. Maths

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  7. more explanation should be given

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  8. The sim of two numbers is 21.3/4 of one of the number added to 2/3 of the other gives a sum of 15.find The two number

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  9. I have not my answer

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  10. Wrong answer

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