Question

Solve the proportions 7/b+5=10/5

Answer 1

Answer:

The solution is b = -1.5

Step-by-step explanation:

* To solve any proportion, we used the cross multiplication

Ex: If a/ b = c/d

- We will multiply the numerator of L.H.S with the denominator

 of the R.H.S and equate it with the product of the denominator

 of the L.H.S with the numerator of the R.H.S

∴ ad = bc

* Lets do that with our problem

∵ $\frac{7}{(b + 5)}=\frac{10}{5}$

∴ 7 × 5 = 10 × (b + 5) ⇒ multiply

∴ 35 = 10(b) + (10)(5) ⇒ simplify

∴ 35 =  10b + 50 ⇒ subtract 50 from both sides

∴ -15 = 10b ⇒ divide both side by 10

∴ b = -1.5

* The solution is b = -1.5