Answer:
40 shops
Step-by-step explanation:
To combine the ratios, we must have the same number of ratio units for restaurants. We can get that by multiplying the first ratio by 4.
S : R = 1 : 2 . . . multiplying by 4 gives . . . 4 : 8
and
R : P = 8 : 3
So, the extended ratio can be written ...
S : R : P = 4 : 8 : 3
Multiplying this by 10 gives 30 for the number of pubs:
S : R : P = 40 : 80 : 30
The number of shops in the city is 40.
