Answer:
120 lb
Step-by-step explanation:
3 boxes ----> 90 lb
1 box -------> 90 ÷ 3 = 30 lb
4 boxes -------> weight of 1 box x 4 = 3 x 4 = 120 lb
You can solve it like this
2=milk (a); 1=milk (b)
9=tea (a); x= tea (b)
2:9=1:x (then multiply means and the extremes)
(means are 9 and 1; extremes are 2 and x)
9=2x
9/2= x
4.5 or 4 1/2=x
Therefore, using 1 litre of milk, we can have 4 1/2 tea.
Step 2, she didn't multiply 8 by 0.75.
Hope this helps :)
27x² and 81x⁵
81 = 27*3
x⁵ = x²x³
81x⁵ = 27*3*x²x³= (27x²)*3x³
We can see that 81x⁵=(27x²)*3x³ includes as a factor 27x²,
so GCF is 27x².
