Find a natural number whose square diminished by 84 is equal to thrice of 8 more than the given number.

Find a natural number whose square diminshed by 84 is equal to thrice of 8 more than the given number .

Find a natural number whose square diminished by 10 is equal to five times of 8 more than the given number.

Thrice the square of a natural number decreased by 4 times the number is equal to 0 more than the number. The number is a. 4 b. 6 c. 5 d. 10

A number whose fifth part increased by 5 is equal to its fourth part diminished by 5. Find the number.

A number whose fifth part increased by 5 is equal to its fourth part diminished by 5. Find the number.

A number whose fifth part increased by 4 is equal to its fourth part diminished by 10. Find the number

the weighted mean of first n natural numbers whose weights are equal to the squares of corresponding numbers , is