Hello Sir,

I have a question .

A bird collector wants to buy 100 birds and to spend exactly $100.
1 Blue Bird= 7 dollars
1 Green Bird= 5 dollars
20 Yellow Birds= 1 dollar

How many blue, green, and yellow birds can he buy?

Please sir i'm waiting for your response.

1 answer

I don't see any way.

The number of yellow birds must be a multiple of 20 less than 100. So,

if there are 20 yellow,
b+g=80
7b+5g=99

If 40 yellow,
b+g=60
7b+5g=98

If 60 yellow,
b+g=40
7b+5g=97

If 80 yellow,
b+g=20
7b+5g=96

None of those setups has positive integer solutions for b and g.
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