An average bagel contains 30 mg of calcium and 2 mg of iron. one ounce of cream cheese contains 25 mg of calcium and 0.4 mg of iron. if leyla wants to eat a combination of bagels and cream cheese that contains exactly 430 mg of calcium and 16 mg of iron, how much of each should she eat?

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally