Hi

Need help on this question.

1. Mrs Loke had some red, green and yellow buttons. She had 80 more green buttons than yellow buttons and 15 more red buttons than green buttons. She used 3/4 of her green buttons and 1/2 of her yellow buttons to sew on some dresses. She had 290 buttons left. How many buttons did Mrs Loke have at first?

Thank you☺