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15% of the people at a concert are women.

30% of the people are girls.

The number of boys is `2/5` of the number of girls and the remaining 860 people are men.

(a) How many people are there at the concert?

(b) If the number of girls were to increase by 20%, how many people would be at the concert?

Notes to student:

If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12