7.39 persons can repair a road in 12 days working 5 hours a day in how many days will 30 persons working 6 hours a day complete a work

39 people : 12 days : 5 hours

//Find 1 person

1 person : 12 x 39 days : 5 hours

1 person : 468 days : 5 hours

//Find 30 people:

30 people : 468 ÷ 30 days : 5 hours

30 people : 15.6 days : 5 hours

//Find 1 hour:

30 people : 15.6 x 5 days : 1 hour

30 people : 78 days : 1 hour

//Find 6 hours:

30 people : 78 ÷ 6 days : 6 hours

30 people : 13 days : 6 hours

13 days

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!