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You need to convert it to algebra. If you have 2 buckets of water each containing 30 litres, then how many litres do you have?

Here’s it’s the same thing. But instead of a number of tanks, they give you a variable x. Ask yourself how many tanks I have of 20l, 35l, 25l and 30l. Then if you write down the expression for answer A and for B, you’ll be able to arrive at the answer

You can also choose numbers in this example, but algebra is probably faster