Answer:
111 books
Explanation:
c + r + y = 270 eq. 1
c = r + 25 eq. 2
y = c + 19 eq. 3
c = books collected by Clare
r = books collected by Ryan
y = books collected by Jerry
from the eq. 2:
r = c - 25 eq. 4
Replacing eq. 4 and eq.3 on eq.1
c + (c-25) + (c+19) = 270
3c + 19 - 25 = 270
3c - 6 = 270
3c = 270 + 6
3c = 276
c = 276/3
c = 92
from eq. 4
r = c - 25
r = 92 - 25
r = 67
from eq. 3
y = c + 19
y = 92 + 19
y = 111
Check:
92 + 67 + 111 = 270
then:
Jerry collect:
111 books
