Nari says, “The sum of 10 and one-third of a number is 25 ” She uses the bar model to write an equation to represent her statement. Expand Image Which equation can Nari write using the bar model?
Answer
A
25 is equal to 10 minus 1 third n
B
25 is equal to 10 plus 1 third n
C
10 is equal to 1 third n minus 25
D
10 is equal to 1 third n plus 25
Explanation
“One-third of a number” is written as n/3, and “the sum of 10 and” means add 10 to that amount. The statement says this sum is 25, so the equation is 25 = 10 + n/3. Choice B says exactly that.
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