Keep getting: You got 1 out of 10 right.

import datetime
import random

from questions import Add, Multiply


class Quiz:
    questions = []
    answers = []

    def __init__(self):
        question_types = (Add, Multiply)
        for _ in range(10):  # Generate 10 random questions with numbers from 1 to 10
            num1 = random.randint(1, 10)
            num2 = random.randint(1, 10)
            question = random.choice(question_types)(num1, num2)
            self.questions.append(question)  # Add these questions into self.questions

    def take_quiz(self):
        # Log the start time
        self.start_time = datetime.datetime.now()
        # Ask all the questions
        for question in self.questions:
            # Log if they got the questions right
            self.answers.append(self.ask(question))
        # Log the end time
        else:
            self.end_time = datetime.datetime.now()
        # Show a summary
        return self.summary()

    def ask(self, question):
        correct = False
        # Log the start time
        question_start = datetime.datetime.now()
        # Capture the answer
        answer = input(question.text + ' = ')
        # Check the answer
        if int(answer) == question.answer:
            correct = True
        # Log the end time
        question_end = datetime.datetime.now()
        # If the answer's right, send back True
        # otherwise, send back False
        # send back the elapsed time
        return correct, question_end - question_start

    def total_correct(self):
        # Return the total number of correct answers
        total = 0
        for answer in self.answers:
            if answer[0]:
                total += 1
            return total

    def summary(self):
        # Print how many you got right and the total number of questions. ex: 5/10
        print("You got {} out of {} right.".format(self.total_correct(), len(self.questions)))
        # Print the total time for the quiz: 30 seconds!
        print("It took you {} seconds to complete!".format((self.end_time - self.start_time).seconds))

Quiz().take_quiz()