Question

if a number is multiplied by one-third of itself the thus obtained is 10800 . What is that

Answer 1

let a number be x.
A/q,

x * x/3 = 10800

x^2 = 10800*3

x^2 = 32400

x =180

Answer 2

let the number be a
according to the question,
a ×( a/3)=10800
${a}^{2} = 3 \times 10800$
${a}^{2} = 32400 \\ a = 180$