Question
Three-fifth of the square of a certain number is 126.15. What is the number ?
Answer: Option A
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Let the number be `x` then,
`3/5 x^2 `= 126.15 `hArr` `x^2` = ` (126.15xx 5/3)` = 210.25 `hArr` `x` = `sqrt(210.25)` = 14.5.
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