My Solution. Would really appreciate some comments/feedback. Thank you

var questions = 5;
var answer = 0;
question = prompt('ONE: Which metal is heavier, silver or gold?');
if (question.toLowerCase() === 'gold'){
    document.write('<h2> 1. Gold is the correct answer.</h2> <br>');
    answer += 1;
} else {
document.write('<h2>1. Sorry! That answer is incorrect.</h2><br>');
}
question = prompt('TWO: How many legs do butterflies have?');
if (question.toLowerCase() === 'six' || question === '6'){
    document.write('<h2> 2. Six is the correct answer.</h2> <br>');
    answer += 1;
} else {
document.write('<h2>2. Sorry! That answer is incorrect.</h2><br>');
}
question = prompt('THREE: What is the largest mammal in the world?');
if (question.toLowerCase() === 'blue whale'){
document.write('<h2> 3. Blue Whale is the correct answer.</h2><br> ');
answer += 1;
} else {
document.write('<h2>3. Sorry! That answer is incorrect.</h2><br>');
}
question = prompt('FOUR: What is the rhino\'s horn made of?');
if (question.toLowerCase() === 'hair'){
document.write('<h2> 4. Hair is the correct answer.</h2> <br>');
answer += 1;
} else {
document.write('<h2>4. Sorry! That answer is incorrect.</h2><br>');
}
question = prompt('FIVE: What is the tallest animal in the world?');
if (question.toLowerCase() === 'giraffe'){
document.write('<h2> 5. Giraffe is the correct answer.</h2> <br>');
answer += 1;
} else {
document.write('<br><h2>5. Sorry! That answer is incorrect.</h2>');
}
if (answer > 0){
document.write('<h1> Congratulations!!! You have ' + answer + ' correct answers</h1>');
} else {
 document.write('<h1> Oh!!! You have ' + answer + ' correct answers</h1>');
}
if (answer === 5){
document.write('<h1> Your Rank is Gold Crown. Outstanding!!!.');
} else if(answer === 4 || answer === 3){
document.write('<h1> Your Rank is Silver Crown. Excellent!!!.');
} else if ( answer === 2 || answer === 1) {
document.write('<h1> Your Rank is Bronze Crown. Great!!!.');
} else {
document.write('<h1> Sorry! You have no Crown. Better Luck Next Time!');
}