"around 50" -- what does it mean?

[Lam Tung]

English Language Tests, Intermediate level

ESL/EFL Test #60 "Cliches", question 4

It's difficult to say exactly how many people are involved but I would say ......... 50.

(a) around
(b) across
(c) through
(d) into

English Language Tests, Intermediate level

ESL/EFL Test #60 "Cliches", answer 4

It's difficult to say exactly how many people are involved but I would say around 50.

Correct answer: (a) around

Your answer was: incorrect
It's difficult to say exactly how many people are involved but I would say into 50.
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Hi Alan!

please explain why is 'around"?
Thanks.
Lam Tung

[Conchita]

The speaker doesn't know exactly how many people are involved. That's why he says 'around 50', which means 'approximately 50'. We can also say 'about 50'. 'Into' has a different meaning that doesn't fit in this expression.