exam Maths Puzzle Numerical Ability

please help me solve this problem 20-4X=20-12

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exam Other Question

on your new job, you can be paid on one of two ways:
plan a: a salary of $28,000 per year.
plan b: a salary of $1,200 per month plus a commission of 5% on gross sales.
for what
box1+box2+box3=30


these three boxes can have{1,3,5,7,9,11,13,15)
numbers can repeat .