Answer:
9
Step-by-step explanation:
let the number be n then 3 times the sum of 2 and the number is
3(n + 2) = 4n - 3 ( 3 less than 4 times the number )
3n + 6 = 4n - 3 ( subtract 3n from both sides )
6 = n - 3 ( add 3 to both sides )
9 = n
That is the number is 9
Answer: 102
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We'll use the formula
A = h*(b1+b2)/2
where
A = area of trapezoid
h = height
b1 & b2 are the parallel bases
In this case,
b1 = 6+7 = 13
b2 = 21
h = 6
Making the area to be
A = h*(b1+b2)/2
A = 6*(13+21)/2
A = 6*(34)/2
A = 204/2
A = 102
Side Note: We don't use the slanted side of 10 cm at all
Answer:
5 tubes of blue paint are used for 15 tubes of white paint.
Step-by-step explanation:
Given:
To paint a mural painter uses 2 tubes of blue paint for every 6 tubes of white paint
Hence,
6 tubes of white paint = 2 tubes of blue paint
Now we need to find number of blue paint tubes used for 15 tubes of white paint.
6 tubes of white paint = 2 tubes of blue paint
15 tubes of white paint = number of blue paint tubes used for 15 tubes of white paint
Hence we will used unitary method to find the same;
Number of blue paint tubes used = 
Hence 5 tubes of blue paint are used for 15 tubes of white paint.