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Suppose that e, i, n and t represent different positive whole numbers such that

n + i + n + e = 9

t + e + n = 10

and

i = 1

What is t?

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

*This problem is taken from the UKMT Mathematical Challenges.**View the archive of all weekly problems grouped by curriculum topic*