X = 15
Inverse operations would be + 5 to the -5 which cancels that out, & adding 5 to the 15 which gives you 15
Let's say the numbers are "a" and "b"
thus

set the derivative to 0, and check the critical points, there's only one anyway
and do a first-derivative test, to see if it's a maximum
Answer
Multiply the divisor and dividend by
✔ 100
The new division problem becomes
✔ 4,860 ÷ 15
The quotient of 48.6 ÷ 0.15 is
✔ 324
Estimating to check, you get
✔ 5,000 ÷ 15 = 333.33
<u>Divide</u>