The mass of Jessie was 72 kg. After joining a slim-fit
programme, her mass decreased at a rate of 3 kg per month. Find the
least number of complete months that Jessie has to be on the
programme before her mass becomes less than 54 kg.
Juz wanna check: the answer given in the book is 6. Personally,
I feel that the answer should be 7.
Pls enlighten...Thanx:)