exam Maths Puzzle Numerical Ability

I need help, this problem deals with the substitution method. Your help will be greatly appreciated.

x + y = 20
30x + 25y = 550

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exam Other Question

|3x+2|-2=4x+1 The six flytrap brothers and sisters ate 115 flies altogether. Farley ate 4 times the number of flies that franny ate. fiona maanged to snap up half the number of flies that farl