Level 3
Tom spent 27 of his salary on a television and 310 of his remaining money on a DVD player. If he was left with $630 himself, how much was his salary?
Level 3
Tricia used 25 of the ribbon to tie some presents. She threw away 47 of the remaining ribbon. As a result, she had 54 centimetres of ribbon left. How much ribbon did Tricia have at first? Give your answer in centimetres.