0.8
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4/5 is equal to 8/10 which is equal to 16/20, so the answer is 16/20.
45/100 or 4.5/10
2 + 45 / 100 = 2 + 9 / 20 ( two and nine twentieths)
3 twentieths in decimal form = 0.15
Converting to twentieths it is fifteen twentieths minus sixteen twentieths, so the result is minus one twentieth.
the common denominator for 9/8 and 7/20 is 40. (45/40 and 14/40)