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24 May, 15:29

Barry has 18 more marbles than heidi. if barry has 92 marbles, write and solve an equation to determine the number of marbles heidi has.

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  1. 24 May, 19:05
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    N = Heidi's marbles

    92 - n = 18 (Barry's 92 marbles - whatever Heidi has = 18 marbles difference)

    92 - n + n = 18 + n (I added n to each side)

    92 = 18+n

    92 - 18 = 18-18 + n (I subtracted 18 from both sides)

    74 = n Heidi has 74 marbles
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