book Maths Puzzle Numerical Ability

x+y=5
49x-49y=5

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Christi's mother gave her $9.00 to buy .10 and .15 stamps. Christi returned with $1.75 in change and a total of 60 stamps. How many of each kind of stamp did she buy?

I need hel The distance an object falls is directly proportional to the square of the time it has been falling. After 6 seconds it has fallen 1296 feet. How long will it take to fall 2304 feet? I figured 1296 = x(6)square but not able to complete.