Set up the equation by writing the number of students in the ratio as a fraction:
3/4= (245-x)/x Cross multiply:
3x= 4(245-x) Multiply on right:
3x= 980-4x Add 4x on both sides:
7x= 980 Divide both sides by 7:
x= 140 this is how many girls there are. And:
245-140= 105= boys
Answer:
1st, 3rd and second last one
Answer:
Don't be lazy, do it by yourself for more brain work!
Step-by-step explanation:
Answer:
C, 2/5
Step-by-step explanation:
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