book Maths Puzzle Numerical Ability

If the voltage V is an electric circuit is held constant, the current I is inversely proportional to the resistance R. If the current is 40 amperes when the resistance is 270 ohms, find the current when the resistance is 150 ohms.

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book Other Question

The graph of the basic exponential function (y = bx) has
two distinctive characteristics:

a) having a y intercept of (0,1), and

b) having a horizontal asymptote of y=0. John and Harvey sold widgets, Harvey sold 2 1/2 times as many widgets as John. If the difference in their sales was 87 units. How many widgets did each of them sell?