girllover1641 girllover1641

31-10-2018
Mathematics

contestada

I need help with this problem 3/5=21/m ...... Please help

Respuesta :

31-10-2018

3/5=21/m

Cross multiply

3m=21(5)

Simplify

3m=105

Divide 3 both sides

m=35

Answer Link

jbasta2 jbasta2

31-10-2018

this is a ratio. cross multiple and then divide to get the value of m.

3m = 105 divide by 3
m = 35

or compare the numerators to each other
how many times can 3 go into 21? 7

so now multiple the denominator by 7 so the fraction keeps the same ratio. 5 x 7 = 35
m= 35

Answer Link

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