Case bought a 10-week-old pig that weighed 30 kg. At 18 weeks, the pig weighed 80 kg. The equation (18 − 10)x + 30 = 80 can be used to find the number of kg (x) the pig gained each week.

Question

How many kilograms did the pig gain each week?

A: 5.75kg
B: 6.25kg
C: 6.75kg
D: 7.25kg

Answer 1

To find the number of kilograms the pig gained each week, we need to solve the equation:

(18 - 10)x + 30 = 80

First, simplify it by evaluating 18 - 10:

8x + 30 = 80

Next, subtract 30 from both sides of the equation:

8x = 50

Finally, divide both sides by 8 to solve for x:

x = 6.25

Therefore, the pig gained 6.25 kilograms each week.

The correct answer is B: 6.25kg