book Maths Puzzle Numerical Ability

hello, i need more help on these problem is factor out perfect squares ?
1)18
2)24
3)147

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book Other Question

If the perimeter is 54, and the width is half the size of the length, then how would you solve for the length and width? find 4 consecutive even numbers so that the products of the second and the fourth is greater than the product of the first and third by 36?