FIFTEEN ELVES MADE SOME IDENTICAL CAKES FOR A PARTY. EACH ELF ATE H...

7. Fifteen elves made some identical cakes for a party. Each elf ate half of a cake, one-fifth of acake, and a third piece, which was six times smaller than the second piece. Three cakes were leftuntouched. How many cakes did the elves make?

Grade 5

© Russian School of Mathematics, 2019