Stones

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 Bob has 15 more stones than Alan.

Colin gives Bob 25 stones.

Bob now has 3 times as much as Alan does.

1) How many has Alan got?

2) How many has Bob got?

Comments

  1. Anonymous10 December 2020 at 18:51

    First, we need to create our equations:
    b = a + 15
    b + 25 = 3a

    now we can substitute our first equation into our second one:
    a + 15 + 25 = 3a
    a + 40 = 3a
    2a = 40
    a = 20

    Now we answered the first one we need to answer the second one. We can just substitute a into the first equation giving you 20 + 15 which is 35.

    Now we know our solutions:
    Alan - 20
    Bob - 35

    ReplyDelete

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