book Maths Puzzle Numerical Ability

slove the equation
y
- +5=0
9

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book Other Question

How do you find the percent of change in these math problems.

1.180 to 150

2. 15,000 to 12,000

3. 6 to 6.50
{{{n^2-3n-18}}}

{{{x^2-16x+64}}}

{{{2x^2+7x+3}}}

{{{2a^2-7a+6}}}

{{{9y^2-16}}}

{{{3a^2+13a+4}}}