Question 8
a) The average of four numbers is 66. Find the expression for the new average when two numbers x and 2x are added to it.
b) 5 years ago, Tina was 2p years old. Next year, Tina’s brother, Jack, will be 7 years older than Tina. Find their total age in 10 years’ time.
c) A zoo has 3 times as many gorillas as tigers. There are 3 more tigers than there are zebras at the zoo. If z represents the number of zebras, in terms of z, how many gorillas are in the zoo?
b) 5 years ago, Tina was 2p years old. Next year, Tina’s brother, Jack, will be 7 years older than Tina. Find their total age in 10 years’ time.
c) A zoo has 3 times as many gorillas as tigers. There are 3 more tigers than there are zebras at the zoo. If z represents the number of zebras, in terms of z, how many gorillas are in the zoo?