Question

# 20. Three fifth of the square of a number is 126.15. What is the number? (1) 145 (2) 1.45 (3) 14.5 (4) 0.145

Solution 20. (3) Let the number be x.
Then, according to the question,
3 of x2 = 126.15
=
*2 = 126.15 x
= 21025
21025
V 100
X
=
21025
4205
29 841
29 29
5 x 5 x 29 x 29
V 10×10
5 x 29
20 = 14.5
10
=
x=

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