Question

`461 / 1.1.`
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Answer 1

`\large\boxed{19(17)/(20)}`

Explanation:

`\text{First step:}\\\\\text{Find LCD}\ (Least\ Common\ Denominator)\\\\LCD=20\\\\4\cdot5=20\\5\cdot4=20\\\\(1)/(4)=(1\cdot5)/(4\cdot5)=(5)/(20)\\\\(3)/(5)=(3\cdot4)/(5\cdot4)=(12)/(20)\\\\9(1)/(4)+10(3)/(5)=9(5)/(20)+10(12)/(20)=(9+10)+(5+12)/(20)=19(17)/(20)`