Javascript Syntax error

// quiz begins, no answers correct
var correct = 0;

// ask questions
var answer1 = prompt('Name a language that rhymes with ooby');
if (answer1.toUpperCase() === 'RUBY'); {
   correct += 1;
} 

console.log(correct);

var answer2 = prompt('Name a language that is also a snake.');
if (answer2.toUpperCase() === 'PYTHON'); {
   correct += 1;
} else {
   correct -= 1;
}

console.log(correct);

var answer3 = prompt('What language do we use to style web pages?');
if (answer3.toUpperCase() === 'CSS'); {
   correct += 1;
}

console.log(correct);

var answer4 = prompt('What language do we use to structure our web pages?');
if (answer4.toUpperCase() === 'HTML'); {
   correct += 1;
}

console.log(correct);

var answer5 = prompt('What language do you use to add interactivity?');
if (answer5.toUpperCase() === 'JAVASCRIPT'); {
   correct += 1;
}

console.log(correct);

// output results
document.write('<p>You got <strong>' + correct + '</strong> out of <strong>5</strong> questions correct</p>');

// outpuk rank
if ( correct === 5) {
   document.write('<p><strong>You earned a gold crown!</strong></p>');
} else if ( correct >= 3 ) {
   document.write('<p><strong>You earned a silver crown!</strong><p>');
} else if ( correct >= 1 ) {
   document.write('<p><strong>You earned a bronze crown!</strong><p>');
}