1.

Mrs. Kapoor has certain sum of money to buy fruits. She can buy `n` mangoes at Rs.1.60 each and have Rs 0.80 left. Alternatively, she can buy `(n+10)` apples at Rs0.70 each and have Rs0.10 left. If Mrs. Kapoor buys 3 mangoes and uses the rest of the money to buy apples, then

Answer» Let Mrs. Kapoor has `x` money in rupees.
Then, `1.60n+0.8 = x->(1)`
`0.7(n+10)+0.10 = x->(2)`
From (1) and (2),
`1.6n+0.8 = 0.7n+7+0.10`
`=>0.9n = 6.3=> n = 7`
Putting value of `n` in (1),
`1.6(7)+0.8 = x`
`=> x = 11.2+0.8 => x = 12`
So, Mrs. Kapoor has `12` rupees.


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