exam Maths Puzzle Numerical Ability

a lady started a chain letter by writing to 4 friends and requesting them to copy the letter and send it to four other friends. if the chain was unbroken until the 5th set of letters were mailed, how much was spent for postage at $8 per letter?

Read Solution (Total 2)

160$ karlo khudhi
7 years agoHelpfull: Yes(0) No(0)

4,16,64,256,1024
totals 1,364*8=$10,912 is the total cost.
7 years agoHelpfull: Yes(0) No(0)

exam Other Question

5x/7-2x/5=6/35 These are fractions 5x, 2x, 6 are all the numerator... Match the graph with its equation.
The graph goes from the bottom row 4 to y 0 and curves back down to the 3rd row.

These are the equations:
a) y = -x^2 - 1
b) y = -x^2 + x