tmua.me Medium Set F Paper 2 · Question 18

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tmua.me Medium Set F Paper 2 · Q18

Paper 2Algebra

Two lists of real numbers have numbers of entries in the ratio $3:2$ . Their means are $20$ and $12.5$ , respectively.

One entry is moved from the first list to the second. The means of the two lists then become $21$ and $13$ , respectively.

How many entries are there in the two lists altogether?

2

4

5

6

10

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