30% = 30/100
= 0.3
Now if we say that x% of a number is y then it actually means that x% multiplied by that number would be equal to y, thus:
30%*56 = 0.3*56
= 16.8
<span>{2y = x + 10
{3y = 3x + 15 |:3
</span>{2y = x + 10
{y = x + 5
{2(x+5) = x + 10
{y = x + 5
{2x+10 = x + 10
{y = x + 5
{2x - x = 10 - 10
{y = x + 5
{x = 0
{y = x + 5
{x = 0
{y = 5
Okay. First simplify all the like terms (all the coefficients and all the variables).
When simplified it should give you:
5x-11
6 centimeters
x will represent the side length of the smaller square, so 2x is the side length of the bigger square.
x*x + 2x*2x = 45
x^2 + 4x^2 = 45
5x^2 = 45
x^2 = 9 (Divide by 5)
sqrt(x^2) = sqrt(9)
x = 3
2x = 6 (Multiply by 2)
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