Tony is using these numbers to make a new number: 12, 1, 4, 7. He can use brackets, +, -, x and the divide sign as often as he wishes.
He can't use any number more than once.
He cannot use powers.
He cannot put numbers together, eg he can't use 147.
What is the biggest number he can make and show how he can make this number. (MathsWatch)