Answer:
15
Step-by-step explanation:
you should divide both 30/2
so u get 15
£9,£21
richard:andrew=3:7
3+7=10
£30÷10=£3
richard=3×£3=£9
andrew=7×£3=£21
oouu I'm in 7th grade science and I already did this I can help!
the girls = 18
so 18÷3=6
6×4=24
24 boys