var percentage, threeCubed, cubeEdges, chessBoard, diceDots;
var correct = 0;

percentage = prompt("What is 20% of 40?"); // 8
threeCubed = prompt("How much is three cubed?"); // 27
cubeEdges = prompt("How many edges does a cube have?"); // 12
diceDots = prompt("How many dots are there in total on a pair of dice?"); // 42
chessBoard = prompt("How many squares are there on a chess board?"); // 64

if (parseInt(percentage) === 8 || percentage.toLowerCase() === "eight") {
    correct += 1;
}

if (parseInt(threeCubed) === 27 || threeCubed.toLowerCase() === "twenty seven") {
    correct += 1;
}

if (parseInt(cubeEdges) === 12 || cubeEdges.toLowerCase() === "twelve") {
    correct += 1;
}

if (parseInt(diceDots) === 42 || diceDots.toLowerCase() === "fourty two") {
    correct += 1;
}

if (parseInt(chessBoard) === 64 || chessBoard.toLowerCase() === "sixty four") {
    correct += 1;
}

document.write("You have answered " + correct + " questions correctly. <br>");

if (correct === 5) {
    document.write("You have won a gold trophy");
} else if ( correct === 4 || correct === 3 ) {
    document.write("You have won a silver trophy");
} else if ( correct === 2 || correct === 1 ) {
    document.write("You have won a bronze trophy");
} else {
    document.write("You didnt get a trophy. Try again next time");
}