A box of apples 52 kg, is 312 yuan, another box of apples 56 kg, is 389 yuan, which box is cheap?

A box of apples 52 kg, is 312 yuan, another box of apples 56 kg, is 389 yuan, which box is cheap?

312/52=6 389/56=6.95
The first case is cheap

Fifty five out of thirty-nine and fifty-seven divided by minus twenty

Fifty five out of thirty-nine and fifty-seven divided by minus twenty
=(39+55/57) /(-20)
=(60-2/57) /(-20)
=-3+1/570
=-2.569/570

How to calculate 55 * 29 + 55 with simple algorithm

55*29+55=55*(29+1)=55*30=1650

How to do it with a simple algorithm

19 * (39 + 55 / 57) = 19 * 40-19 * 2 / 57 = 760-2 / 3 = 759 and one third