6). 1 kg = 1000 grame
1000 : 4 = 250 g zahar ( crema de vanilie )
2/5 din 1000 = 1000 : 5 × 2 = 400 g ( crema de ciocolata )
1000 - 250 - 400 = 350 g zahar ( pt blat )
7). R < Î ( INTOTDEAUNA )
a : 6 = 25 rest 0
a = 25 × 6 + 0
a = 150
a : 6 = 25 rest 1
a = 25 × 6 + 1
a = 151
a = 25 × 6 + 2 = 152
a = 25 × 6 + 3 = 153
a = 25 × 6 + 4 = 154
a = 25 × 6 + 5 = 155
150 + 151 + 152 + 153 + 154 + 155 = 915 ( suma numerelor )