Answer:
May be helpful.
thx.......
342
Step-by-step explanation:
x=5
72+72+18(5)+9+18 (5)+9=342
x= morning
y = afternoon
x + y = 10
x=10-y
5x + 6y =57
5(10-y) +6y =57
50-5y +6y =57
y=7
x=10-7 =3
check 3*5 = 15, 7*6 = 42, 42 + 15 = 57
3 morning practices
