Tom has ∆ marbles. Bob has 10 marbles. Tom has 3 more marbles the Bob. Which number sentence is correct?
- ∆ + 3 = 10
- ∆ - 3 = 10
- 3 + ∆ = 10
- None of these
Explanation
Tom has 3 more marbles than Bob.
Bob has 10 marbles, so Tom has 10 + 3 = 13 marbles.
So the correct equation is:
∆ - 3 = 10 (Because if Tom has ∆ marbles, and we subtract 3, it equals Bob's 10 marbles.)
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