Respuesta :

First solve for 21/7 and you get 18/? = 3.

Then you work it backwards and say 3 * what = 18

Answer is 6

Answer:6

Step-by-step explanation:

18/? =21/7

you are going to cross multiply

? × 21 = 18 × 7

? × 21 = 126

Then you divide bothside by 21

? = 126/21

? = 6

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