72 is 4/9 of a number. What is that number?
Please attempt the above question timed by clicking on the digital timer below:
Hours:Minutes:Seconds
00:00:00
Now, please click on “Reveal Technique” below to reveal the three (3) second “winning edge technique” leading to the correct answer:
Technique © :
Step 1. Multiply 72 by 9/4 [inverse of 4/9 given in question]
72 x 9/4
Step 2. Cancel 72 with 4 and multiply out the resulting number by 9
18 x 9 =162.
Answer: 162.
Time allowed: 30 seconds Time taken using the technique: 3 seconds
Time saved = 27 seconds [9/10th of time allowed by examiner]
Now attempt the Practice question given below to check whether you can arrive at the correct answer within three seconds:
WORK SHEET – Practice question
21 is 3/7 of a number. What is that number?
Step 1.Step 2.
Now click on “Reveal” to check your answer is correct:
Answer: 49
