ExamPrepWay
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Solve this faster with the right shortcut first
- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
Question Locked
Unlock full topic access, detailed explanations, and premium practice support.
Upgrade to continueCorrect answer and explanation unlock after the free practice limit.
Upgrade to continueShort Explanation
PremiumShort solution is premium content.
Upgrade to continueDetailed Explanation
Correct Answer:
Method / Topic: Average
Average = total / number of items. If the average of 4 numbers is 15, total = 4×15 = 60. The known numbers add up to 10+12+18 = 40. So x = 60-40 = 20.
See full explanation + shortcut trick
Compare the quick idea with the premium step-by-step explanation and faster solving trick for this pattern.
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
Question Locked
Unlock full topic access, detailed explanations, and premium practice support.
Upgrade to continueExplanation
Correct answer and explanation unlock after the free practice limit.
Upgrade to continueShort Explanation
PremiumShort solution is premium content.
Upgrade to continueDetailed Explanation
Correct Answer:
Method / Topic: Average
Average = total / number of items. If the average of 4 numbers is 15, total = 4×15 = 60. The known numbers add up to 10+12+18 = 40. So x = 60-40 = 20.
See full explanation + shortcut trick
Use the free answer check first, then unlock the complete breakdown, shortcut path, and richer explanations for similar questions.
Keep Practicing This Pattern
Recommended Next Practice
Use these suggestions after solving the practice questions above.