Question

if 2= 3.50 then what is 3,4 and 5 cost?

Answer 1

The value of 2 is 3.5

We need to find the value of 3, 4, 5

Let us use the ratio method

2 : 3.50

3 : x

Use the cross multiplication

$2\times x\text{ = 3}\times3.5$

2x = 10.5

Divide both sides by 2

x = 5.25

The cost of 3 = 5.25

Do the same with 4

2 : 3.50

4 : x

Use the cross multiplication

$2\times x=4\times3.50$

2x = 14

Divide both sides by 2

x = 7

The cost of 4 = 7

Do the same with 5

2 : 3.50

5 : x

Use the cross multiplication

$2\times x=5\times3.50$

2x = 17.5

Divide both sides by 2

x = 8.75

The cost of 5 = 8.75