If Monica took ten subjects, Marius took 10+4 = <<10+4=14>>14 subjects.

Marius and Monica have 14+10 = <<14+10=24>>24 subjects which they've taken.

Since Millie is taking three more subjects than Marius, she is taking 14+3 = <<14+3=17>>17 subjects

Together, the three have taken 24+17 = <<24+17=41>>41 subjects.

# Answer

41
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Millie, Monica, and Marius are taking subjects for school. Millie takes three more subjects than Marius, who takes 4 subjects more than Monica. If Monica took 10 subjects, how many subjects all take altogether?
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41
Millie, Monica, and Marius are taking subjects for school. Millie takes three more subjects than Marius, who takes 4 subjects more than Monica. If Monica took 10 subjects, how many subjects all take altogether?
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