Which of the following numbers can be represented as a square?4, 15, 21, 25, 30

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Solution

$We can represent only 4 and 25 as the squares of some numbers . 4 = 2 \times 2 = 2^{2} 25 = 5 \times 5 = 5^{2}$

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The number 144 can be represented by 12x12 square grid . Which of the following can also be represented on a square grid ?

a) 70 b) 39

c) 50 d) 81

Heights in metre	$16 - 20$	$21 - 25$	$26 - 30$	$31 - 35$	$36 - 40$	$41 - 45$	$46 - 50$	$51 - 55$
Number of trees	$10$	$15$	$25$	$30$	$30$	$50$	$35$	$20$

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