exam Maths Puzzle Numerical Ability

Problem: Joe has a collection of nickels and dimes that is worth $5.65. If the number of dimes were doubled and the number of nickels were increased by 8, the value of the coins would be $10.45. How many dimes does he have?

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exam Other Question
for what value of m will the graphs of 3x+my=6 and 2x-8y=4 have infinite solutions? Find the vertices of a hyperbola with the equation (x + 3)^2 - 4(y - 2)^2 = 4.

a. (-4, 2) and (-2, 2)
b. (-5, 2) and (-1, 2)
c. (4, -3) and (0, -3)
d. (3, -3) and (1, -3)