The ratio of boys to girls in the school is 4: 3 if there were 16 boys how many girls at in band?

Allie answered 72% of the questions on her math test correctly. if she answered 18 questions correctly, how many questions were on the test?

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?