Question

a bag contains 70 marbles, some red and some green. THe ratio of red marbles to green ones is 2:5. How many red marbles are there?

Answer 1

$\textbf {Hey there, here is the solution.}$

.............................................................................................

Total number of marbles = 70 (given)

Ratio of red marbles : green marbles = 2 : 5

.

STEP 1: Solve x:

Let x be the constant ratio

2x + 5x = 70

7x = 70

x = 10

STEP 2: Find the number of red marbles:

Red marbles = 2x = 2(10) = 20

Answer: There are 20 red marbles.

.............................................................................................

⭐$\textbf {Cheers}$⭐

Answer 2

let the number of red marbles and green marbles be
2x and 5x
then acc to question
2x+5x=70
7x=70
x=10
hence the number of red marbles is 2x
=2×10=20