Simon spent ³₇ of his salary and gave $1764 to his wife. Of the remaining amount, he saved ¹₄ of it and gave ⁵₁₂ of it to his sisters. He then donated ²₃ of what he had left away and gave the remaining $21 to his son. What was Simon's salary?

Spent	Wife	Saved	Sisters	Donated	Son	Total
3 u	4 u					7 u
	$1764	1 p	3 p
			5x3	7x3
				2x7	1x7
			15 b	14 b	7 b $21

Amount that his son received = 7 b

7 b = 21
1 b = 21 ÷ 7 = 3

Amount of his salary given to his sisters, his donations and his son
= 15 b + 14 b + 7 b
= 36 b
= 36 x 3
= $108

3 p = 108 
1 p = 108 ÷ 3 = 36

Amount of his salary given to his savings, his sisters, his donations and his son
= 1 p + 3 p
= 4 p
= 4 x 36
= $144

Amount of his salary given to his wife, his savings, his sisters, his donations and his son
= 1764 + 144
= $1908 

4 u = 1908 
1 u = 1908 ÷ 4 = 477

Simon's salary
= 7 u
= 7 x 477
= $3339

Answer(s): $3339