See AC Lim's answer to salted egg's Secondary 1 Maths Singapore question

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Hope this helps

Bala J

3 years ago

The question says 60n is a perfect cube. The solution is for 60n as a perfect square. should 2^3 X 3^3 X 5^3. n = 2 X 3^2 X 5^2 = 450.

AC Lim

3 years ago

Ooops, my mistake. Thank you for highlighted.