Question

solve this by balancing method​

Answer 1

Answer:

3

Explanation:

$k = \frac{p + 2q}{3}$

$7 = \frac{p + 2 \times 9}{3}$

$21 = p + 18$

$p = 21 - 18$

=3

Answer 2

Answer:

k=7

q=9

k=(p+2q)/3

7=(p+2×9)/3

7=(p+18)/3

7×3=(p+18)/3×3

21=p+18

21-18= p+18-18

3=p

p=3