Question

subtract 21/5 from the sum of 4/5 and-2/3​

Answer 1

Step-by-step explanation:

({4/5)+(-2/3)}-(21/5)

{(12-10)/15}-(21/5)

(2/15)-(21/5)

(2-63)/15

-61/15

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Answer 2

Step-by-step explanation:

$\frac{4}{5} + \frac{ - 2}{3} lcm \: of \: 5 \: and \: 3 \: is \: 15 \\ \frac{4 \times 3}{5 \times 3} = \frac{12}{15} \\ \frac{ - 2 \times 5}{3 \times 5 } = \frac{ - 10}{15} \\ \frac{12}{15} + \frac{ - 10}{15} = \frac{12 + ( - 10)}{15} = \frac{2}{15 } \\ \frac{21}{5} - \frac{2}{15} = \frac{21 \times 3}{15 \times 1} = \frac{63}{15} = 4 \times \frac{3}{15} = 4 \times \frac{1}{5}$

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