exam Maths Puzzle Numerical Ability

find the constant variation of 7y=2x

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exam Other Question

Heres the question:
A farmer wants to buy 100 animals for $100.00 (must buy at least one of them)

Horses-$5.00
Cows-$3.00
Chicks-.50

How many horses,cows and chicks does the farmer need to have 100 and 100.00? My mom says that dad likes his slope to be (50/1). I want to know what they are talking about...? My dad is a math guru, kinda. Also, he said on off days he has his slope (1/50). Now, he wants me to find the best slope for a medium day. Can you help?