The answer is 4 because you multiply both 48 and 12 by the variable (and considering the variable is x) it would equal: 48=12x then you divide both ides by 12 it would equal 4=x the variable equals 4
To get the answer, you would divide both sides by 15 to get the variable (t) by itself. In which case, 75 divided by 15 would equal t. 75 divided by 15 is equal to 5, which means t=5.
The idea is to "isolate" the variable, in this case "x", on one side. In this case, you would start by multiplying both sides of the equation by "x".
12
That would be the reciprocal of wavelength.( 1 ) divided by (wavelength) .
62
That is mileage (1,555 miles) divided by miles per gallon (MPG) (Known MPG on the driven vehicle or estimated at 20 MPG) times fuel cost (Estimated based on National Average in US dollars, currently $3.50) equals trip fuel cost. That is 1,555 divided by 20 mpg equals 77.75 times $3.50 fuel cost equals $272.15 or there abouts.
This answer applies to programming languages in general. The equals sign is used for assignment. For example, the code "$variable = 1" assigns the value of 1 to the variable $variable. If you want to test whether values are the same (equality) the double equals sign is used. For example, when you want to verify that $variable has been assigned the value of 1 you would use: $variable == 1
450 divided by two would equal 225.
The variable 'x' would equal (8-y)/2. The variable 'y' would equal 8-2x.
2800.3 divided by 100 would equal 28.003.
3