At a certain range of depths, the temperature of Earth's interior, in degrees Celsius, is expressed as 10d+20, where d is the depth in kilometres. Determine the temperature at a depth of 15km.

I really don't get this, plz help!

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i really need some homework help im desperate!!At a certain range of depths, the temperature of Earth's interior, in degrees Celsius, is expressed as 10d+20, where d is the depth in kilometres. Determine the temperature at a depth of 15km
five more than three times a number is forty-one. Let x represent the number. Write an equation and solve for the variable.
five more ---> + 5
three times a number ---> 3x
is ---> =
forty-one ---> 41

5+3x=41 ??
i know how to write it i don't know how to answer it!
would this be right: 3 times x plus 5 equals 41

x times 3 divided by 3 = 41 divided by 3