W1.5

Front

W1.5

Solve this function machne problem:

Back

Hint:

Do the operations in order:

- first: put the input in the function machine. Here : worked hours = 48

- then do the first operation

- finally do the second operation

You have your final answer.

Front

Answer:

Back

Front

Challenge:

Use the same function machine to work out how many hours has worked the plumber if they have been paid £191.

Back

Hint:

Use the formulae the other way around. Start from the end and do the inverse operations.

Front

Challenge answer:

Back

191 - 45 = 147

147 / 21 = 7

The plumber worked for 7h.