Nathan deposited 7/9 of his allowance into his savings account. he spent the remaining ammount, or $2.50. how much did nathan deposit into his savings account?

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint