Final answer:
To find the original number after an increase of 40% resulted in 420, we can divide 420 by 1.4 to get the original number of 300.
Step-by-step explanation:
To find the original number after an increase of 40% resulted in 420, we can use the formula:
Original number * (1 + 40%) = 420
To solve for the original number, we can rewrite the equation as:
Original number * 1.4 = 420
Dividing both sides of the equation by 1.4, we find that the original number is 300.