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Write the number In scientific notation 82.4
19/4 = 4 and 3/4
In those countries that use the long scale (based on powers of a million) eg Europe:1 trillion = million3 = 1018 ⇒ 211/2 trillion = 2.15 x 1019, ie exponent is 19.In those countries that use the short scale (based on powers of a thousand), eg USA:1 trillion = thousand x thousand3 = 1012 ⇒ 211/2 trillion =2.15 x 1013, ie exponent is 13.
You can write this as two equations, and solve them separately. The two equations are:x - 19 = -3and:-x - 19 = -3
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