Question 103236
a=mg of Ca in an apple, b=mg of Ca in a bannana, g=mg of Ca in an orange
b=a+3...a=b-3
g=b+40
g=5a+b...g=5(b-3)+b...g=5b-15+b...g=6b-15...g-6b=-15
.
g=b+40
C) g-6b=-15
.
replace b+40 for g in equation C)
b+40-6b=-15
-5b+40=-15
-5b=-55 subtract 40 from each side.
b=11 mg divide each by -5.
a=8 mg
g=51 mg
.
Ed