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1.

If John’s salary was $ 5u, he left with $ ( 5u -1300 ) after donation. So he was left with $ 3u after spending his salary on donation and gift to parent.

3u = 1300 + (5u – 1300)/5

3u = u + 1040

2u = 1040

u = 520

(5u – 1300)/5 = 1300/5 = 260

He gave $ 260 to his parent. 

2. 

If Mrs. Lee made 10u puffs, then she was left with 3u puffs in the end.

(a) Given 

10u – 3u = 50 + ( 10u – 50 ) * 2/5

7u = 30 + 4u

3u = 30

u = 10

10u = 100

She made 100 curry puffs.

(b) 3u = 30

She left 30 puffs. 

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