Problem related to gases

1. A bottle filled with nitrogen under a pressure of 1.5x10^7 Pa at a temperature of 27 ° C has a mass of 97 kg.  Part of the nitrogen is consumed, so the pressure in the bottle, at a temperature of -3 ° C, is 6x10^6 Pa, and the weight of the bottle is 93.5 kg.  How much mass of nitrogen is left in the bottle?
Solution given in the textbook: \(m_2=\frac{\triangle m\times p_2\times T_1}{p_1\times T_2-p_2\times T_1}=2.8kg\)


Me: I constantly get 1.55kg. I will post the image of my work.
https://ibb.co/qjNQQrn

I would be glad if someone could do this and help me understand these types of problems. My first language isn't English so sorry If I did not use the right wording. Thanks in advance!