Question

solve : n/2 + n/5 =7​

Answer 1

$\frac{n}{2} + \frac{n}{5} = 7$

$\frac{5n + 2n}{10} = 7$

$\frac{7n}{10} = 7$

$7n = 7 \times 10$

$7n = 70$

$n = \frac{70}{7}$

$n = 10$

Answer 2

Answer:

$10( \frac{n}{2} + \frac{n}{5} ) = 10.7$

10.n/2+10.n/5=10.7

5n+2n=10.7

7n=10.7

multiply the numbers

7n=70

Divide both sides of the equation by the same term

7n/7=70/7

Cancel terms that are in both the numerator and denominator

N=10

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