Question

Barry has 18 more marbles then Heidi. If Barry has 92 marbles right and solve any equation to determine the number of marbles Heidi has

Answer 1

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

Hope this helps!