Question

You know that 15% of a number n is 12. How can you use this to find 30% of n? 45% of n? Explain.

Because 30% of n is equal to [ ] times 15% of n and 45% of n is equal to [ ] times 15% of n, you can write

30% of n=[ ] ×12= [ ]

and

45% of n= [ ] ×12= [ ]

Answer 1

30% is 24
45% is 36
take 15% and multiply it by however much it takes to make the percentage than multiply that by 12