Dear you need to first do the math of each side of the inequality. If the negative number is like -25 and -5, the greater one is -5. The -25 would be least. < means it’s not equal so that an open circle. It’ll look like this, o. If it has the line underneath then it’s equal to the number. It would be a closed circle like this, •. Not sure if that’ll help.
You're equation will look like:
R = 1167 + 1167 + 1167 - 239
To get the answer, simplify
R = 1167 + 1167 + 1167 - 239 = 3262
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6 centilitre = 60 millilitre
Total liquid consumed = 355ml + 60ml = 415 mlillilitres