10.(a) Nadira has some T-shirts that are either white or blue or green. The numbers of T-shirts are in the ratio white : blue : green= 5:4:1.
48 of the T-shirts are blue.
Work out the total number of T-shirts.

120 shirts

Step-by-step explanation:

Let the number of blue shirt be= 4x

Let the number of white shirt be= 5x

Let the number of green shirt be= x.

Number of blue shirt is 48, x=12

Total shirts=10x=10*12=120

120

Step-by-step explanation:

white : blue : green

5        :4          :1

48 are blue

48/4 = 12

Multiply each by 12

white : blue : green

5*12   4*12     1*12

60        48        12

Add the numbers together to get the total

60+48+12

120

probability for j is 1/4

while

a is 1/6