Josephine bought 8 packets of biscuits. Each packet had a mass of 500 g

She repacked them into 3 boxes. The first box was twice as heavy as the

second box. The third box was 60 g heavier than the second box.

What was the mass of the second box?

Answer: 985 g

Step-by-step explanation:

Total mass = 8 * 500g = 4000g

Let the three new packs be X, Y, and Z, for first, second, and third pack respectively.

4000g = X + Y + Z

let's put X and Z in terms of Y, since we're trying to solve for the second pack.

X = 2Y, and Z = Y + 60

Therefore,

4000 = X + Y + Z

4000 = 2Y + Y + Y + 60

4000 = 4Y + 60

4000 - 60 = 4Y

3940 = 4Y

3940 : 4 = Y

985g = Y = mass of the second pack