What do i need to convert mass of product to ma's of a reactant

Given A+ 3B C+4D
For instant u have rhe mole of one of the compond of the given equation...
Use the mole ratio of the balance equation and then convert to mass

Mole =mass ÷Mr

For instant mole ration of the productd to the reactant A is 4:1
If u have mole of D u can find that of A and so on...

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)