-a/2=10 what is the value of a

-20

Step-by-step explanation:

(-a/2=10)/-1

=a/2=-10

a=-10*2

a=-20

15% chance.

step-by-step explanation:

3/10 times, the 5 year old will get a tablet. 5/10 times, the 13 yer old will get a tablet. multiply both fractions to get 15/100 times, both would have a tablet.