# Thread: Solving for unknown varilable

1. ## Solving for unknown varilable

How do you solve this problem. Please provide step by step details. Thanks!
Solve for B
V=1/3 Bh
V=20, h=4
(Note: I could not do fractions so 1/3 is a fraction)

Solve for h
A=1/2(B+b)h
A=49.5, B=17, b=16

2. For the first one if you divide both sides by $\dfrac{h}{3}$ you will make B the subject: $B = \dfrac{3V}{h}$

3. here is how i did the second equation.

$49.5={\frac {1}{2}}(17+16)h$

$(2)49.5=(17+16)h$ multiply through by ${\frac {2}{1}}$ to clear fraction.

$99=(33)h$ multiply left side and sum numbers in brackets on right.

${\frac {99}{33}}={\frac {33}{33}}h$ divide both sides by 33.

$3=h$

hope that helps.