It is: 0.64+4/25 = 4/5 or 0.8
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2/5 + 4/25 = 2x5/5x5 + 4/25 = 10/25 + 4/25 = (10 + 4)/25 = 14/25
0.84 or 0.02666... or 0.072 depending on whether it is (4/5) + (1/25) or (4/(5+1))/25 or ((4/5) + 1)/25 Another View: it would be 21 over 25.
2 plus 4/25 = 2.16
42?
If two fractions share an equal denominator, you can simply add the top, so 15 + 4 = 19, so therefore = 19/25