Ratio// please help!!

Step-by-step explanation:

1.49 ÷ 120 = 0.0124 GBP per gram

0.89 ÷ 100 = 0.0089 GBP per gram < 0.01 (The price of loose sweets is better value)

The given certain number is 17.

Step-by-step explanation:

Let the given certain number = k

So, according to the question,

2 + k = 2k - 15

or, 2 +  15  = 2k - k

or,  k = 17

hence the given certain number is 17.

CHECK:

2 more than 17 = 19, and

19 is 15 less than 2 times 17