12. Rachel buys three identical bags of sweets and 5 cans of drink, the total cost of these items came to £4.90. Rosie buys just one bag of sweets and three cans of drink and pays £2.70. What is the cost of a bag of sweets?
I would avoid using algebra ...
First bit of info: three bags of sweets and 5 cans of drink, cost £4.90
Second bit: one bag of sweets and three cans of drink cost £2.70 so if we triple this [to get the same amount of sweets]
..................three bags of sweets and 9 cans cost £8.10
So you shoud be able to see how to get the cost of 4 cans, then divide to get one and them work out the sweets.
Or you could make the same number of cans ..