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Answer

10.

Let A be the price of 1 apple.
Let M be the price of 1 mango.

9A + 4M = 4A + 6M
=> 5A = 2M
=> M = (5/2)A

So if all the money is spent only on apples,

9A + 4M = 9A + 4(5/2)A = 9A + 10A = 19A

So she can buy 19 apples #

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Question 11

80 x (33/60) = 44 km
Mr Ahmad has driven 44km after 33min.

Let d be the remaining distance that Mr Ahmad needs to drive to Town B.
d / 80 = (d + 44) / 100
100d = 80d + 3520
20d = 3520
d = 176

176 + 44 = 220
The distance between the two towns is 220km.

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