Answer:
143
Step-by-step explanation:
The average for the 10 bowling games is given by:
[tex]A = \frac{6*143+4x}{10}[/tex]
Let 'x' be the score of each of the last four games. If her average score was 143, then the score for each of Jane's last four games is:
[tex]143 = \frac{6*143+4x}{10}\\4x=1430-858\\x=143[/tex]
Jane scored 143 in each of her last four games.