exam Maths Puzzle Numerical Ability

0.03c-0.1 = 1.4c+9
0.03c-1.4c=9+0.1
-1.37c=9.1
c=9.1/-1.37 c=-9.1/1.37

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exam Other Question

If the total cost of apples is b cents, what is a general formula for the cost, in cents, of y apples?

a. b/xy
b. x/by
c. xy/b
d. by/x
e. bx/y

The answer is �D�, but we don�t know why... 7k - 8 + 2(k+12) = 52