A man has 25 sweets and his son has 55 sweets. Find the number of sweets that the man has to give to his son so that his son would have 4 times as many sweets as him.

Hello, your answer would be  add 16.why? simply if you add 16 to both sides, you'll get an equal equation to the precedent one, as the rule says and -16 and +16 are opposites so they both cancel out leaving the x alone.

The answer would be 8.333