Answer:


Step-by-step explanation:
1st number = x
2nd number = y
2x + y = 26
-
x + y = 10
x = 16
26 - (2 x 16) = -6
10 - 16 = -6
Number 1 is 16
Number 2 is -6
Answer:
He has 18 full sheets.
Step-by-step explanation:
44 + 52 + 67 = 163
163/9 = 18.11
The question specifically asks for a whole number, not a decimal or fraction, so the answer is 18 full sheets.
Answer:
Books Galore has the lowest unit price
Step-by-step explanation:
if you divide main streets books, 10 ÷ $5.20 = $1.92
Books galore : 6 ÷ $3.60 = $ 1.66
Answer:
7 years
Step-by-step explanation:
Given that:
Let Richard's age = x
Elder sister's age = 2x
Youngwr sister's age = x - 2
Product of sisters ages = 70
2x * (x - 2) = 70
2x² - 4x = 70
2x² - 4x - 70 = 0
x² - 2x - 35 = 0
x² - 7x + 5x - 35 = 0
x(x - 7) +5(x - 7) = 0
(x - 7) or (x + 5) = 0
x = 7 or x = - 5
X can't be negative
Hence, x = 7
Richard is 7 years