Question

solve all the questions with formula
I know the answer but I want formula/process​

Answer 1

It can be solved by using

$\huge\bold{Unitary\ Method}$

Answer 2

Step-by-step explanation:

Q 1

given

speed=72km/h

we have to convert km/h into m/s

5/18*72=>20/m

1m=60second

so

distance covered by Tain in 60second

=60*20

=1200

option{b}

Q2

given

cost of 15 mangoes=180

cost of1 mango=180/15=12

so,

cost of 25 mangoes=25*12=>300

hence:

the cost of 15 mangoes are ₹300

OPTION-D

your all questions will be solved by above process

I hope it will be helpful so please mark me brainlist