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21. If Alice earned $ u per month, she spent $ ( u -240) in March. In April, she spent 10% less or $ 0.9( u -240) and she saved $ (u – 0.9( u -240)) = $ ( 0.1u + 216)

Given the saving increased by 20% in April,

1.2(240) = 0.1u + 216

0.1u = 72

u = 720

So she earned $ 720 per month. 

22. If there were 4u blue balloon in the beginning, there were (66- 4u) pink balloon. 17 pink balloon burst, so there were left with ( 49 – 4u ) pink balloons.

75% increased in blue balloons gave 1.75 * 4u = 7u blue balloons in the end.

7u + 49 – 4u = 79

3u = 30

u = 10

66 – 4u = 26

There were 26 pink balloons at first. 

 

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