21/56 = 27/n nilai n adalah... a.56 b.72 c.78 d.84 2/4 + 1/3 =n.nilai n adalah... a.3/12 b.2/12 c.5/6 d.7/6 tolong pakai caranya

1.
21/56 = 27/n
21n = 56 × 27
n = (56 × 27) ÷ 21
n = 56 (a)

2.
2/4 + 1/3 = n
6/12 + 4/12 = n
10/12 = n
5/6 = n (c)

1. B
[tex] \frac{21}{56} = \frac{27}{n} \\ 21n = 1512 \\ n = \frac{1512}{21 } \\ n = 72[/tex]
2. C
[tex] \frac{2}{4} + \frac{1}{3} = n \\ \frac{6 + 4}{12} = n \\ \frac{10}{12} = \frac{5}{6} = n[/tex]