A sandwich and a cup of tea cost £2.10. Two sandwiches and a cup of tea cost £3.70.
Calculate the cost of a cup of tea. Show your working.
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Let's make sandwich "s" and tea "t."

Make an equation with the variables.

a. 1s + 1t = 2.10

b. 2s +1t = 3.70

Then, do 3.70-2.10, to find the cost of a sandwich. It equals 1.60.

Then, do 2.10-1.60 to find the cost of a cup of tea, which is 0.50.

SO: The cost of a cup of tea is £0.50.

The cost of a sandwich is £2.10.

Hope this helps!

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.