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2 March, 10:15

A man spent exactly $2.50 on 3-cent, 6-cent, and 10-cent stamps. if he bought ten 3-cent stamps and twice as many 6-cent stamps as 10-cent stamps, how many 10-cent stamps did he buy?

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  1. 2 March, 10:24
    0
    He bought 10 x 3 cents stamps

    20 x 6 cents stamps

    10 x 10 cents stamps
  2. 2 March, 11:26
    0
    Yas

    t=number of 3 cent

    s=number of 6 cent

    n=number of ten cent

    ten 3 cent stamps (t=10)

    and 2 times as many 6 cent as 10 cent (s=2n)

    what is n?

    find how much are 3 cent

    3 times 10=30

    30 cents are 3 cents

    convert to cents

    250-30=220

    220=6s+10n

    s=2n

    220=6 (2n) + 10n

    220=12n+10n

    220=22n

    divide both sides by 22

    10=n

    he bought 10 ten cent stamps
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