What are three ratios equivalent to 18: 4

Hi, can anyone show me how to do this problem? 100 points for this. in advance

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250