Nine families went on a picnic. each family had carried a cake for the picnic. 2/3 of each cake was eaten. find out how much cake was eaten in all.?

Since there is nine families, each family brought a cake to the picnic, and 2/3 of each of them were eaten --> If you take the number of cakes brought and multiply it with the number eaten with each cake (2/3 * 9 = 18/3 = 6) you get the answer to be 6 cakes eaten by everyone  

That’s what i got when i looked up what the solutions were

A= r2 × 3.14 7x7 ↓ ↓ 49 × 3.14 = 153.86 → 153.9