Any of them. To get 50 to 30 you could...
subtract 20
add -20
divide by 5/3
multiply by 3/5
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-add 3n to both sides -subtract 2 from both sides -cancel out the both -divide 28 by 7.
12
To convert from degrees Celsius in degrees Fahrenheit, multiply the number by 9, divide by 5, and add 32. In this instance, 30 x 9 = 270 / 5 = 54 + 32 = 86.Therefore 30 degrees Celsius is equal to 86 degrees Fahrenheit.
40
56 ÷ 30 = 1 with remainder 26.Then, add a decimal after 1 and continue dividingAfter bringing down your zero it becomes 260Then you multiply 8x30 to make 240 which you subtract from 260After that you get 200, and then you use 6 again to make 180 to subtract it from 6.For you answer you get 1.86