The ratio of laptops to tablets in the stock room of a store is 13 : 17. If there are a total of 90 laptops and tablets in the stock room, how many laptops are in the stock room?

39  laptops

Step-by-step explanation:

Step one:

Given data

The ratio of laptops to tablets in the stock room of a store is 13 : 17

The sum of the ratio is= 13+17= 30

there are a total of 90 laptops

Required

The number of laptops

Step two:

Applying the part to all method

let the number of laptops be x

so

13/30= x/90

cross multiply we have

30x= 13*90

30x= 1170

x= 1170/30

x=39  laptops

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

answer: they are supplementary angles

step-by-step explanation: 161+19=180. supplementary angles equal 180 degrees