Tissues are sold in packs and boxes A pack holds 20 tissues and a box holds 120 tissues Sia buys P packs of tissues and B boxes of tissues She buys a total of T tissues Write down a formula for T in terms of P and B

T=120 (P+B)

Step-by-step explanation:

If a pack holds 120 tissues, then P packs will hold (P*120) tissues

This implies,

1 pack : 120 tissues

P packs : 120P tissues

Also, if a box holds 120 tissues, then B boxes will (B*120) tissues

This implies,

1 box : 120 tissues

B boxes : 120B tissues

Writing a formula in terms of T, where T is the total we obtain,

T=120P + 120B

Using the idea of factorization we obtain

T=120 (P+B)