Question

please solve this question
please give right answer...​

Answer 1

Answer:

take lcm of then divide the number with l or also divide with right hand side

Answer 2

$2 {l}^{2} + \frac{ {l}^{2} }{2} = 90 \\ \frac{ {4l}^{2} + l^{2} }{2} = 90 \\ \frac{5 {l}^{2} }{2} = 90 \\ 5 {l}^{2} = 90 \times 2 \\ 5 {l}^{2} = 180 \\ {l}^{2} = \frac{180}{5} \\ l ^{2} = 36 \\ l = \sqrt{36} \\ l = \sqrt{6 \times 6} \\ l = 6 \: \: \: \: \: answer$