Question

Mandy brought some flour. she used 30% of the flour to bake cake and 50% of the remainder to make some pancakes. there were 1400 g of flour left. how much flour did Mandy buy?

Answer 1

1) 100% - 30% = 70% - remainder

70% = 0,7
50% = 0,5

2) 0,5 * 0,7 = 0,35 = 35% - made some pancakes

3) 70% - 35% = 35% = 0,35 (= 1400 g)

4) 1400 : 0,35 = 4000 g = 4 kg  -  aswer.