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\frac{6}{20}+\frac{15}{20}\approx 1.05
Least common multiple of 10 and 4 is 20. Convert \frac{3}{10}=0.3 and \frac{3}{4}=0.75 to fractions with denominator 20.
\frac{6+15}{20}\approx 1.05
Since \frac{6}{20}=0.3 and \frac{15}{20}=0.75 have the same denominator, add them by adding their numerators.
Add 6 and 15 to get 21.