First add 45 and 55 because sum means addition. 45+55=100 and teiple means multiplication and 3x100= 300 hope this helped :)
81,149, 274.... adding three numbers from the last would help you
like if you take 7 = 4 + 2 +1
or 13 = 7 + 4 +2
similarly 44+24+13 = 81
81+44 +24 = 149
149 + 81 +44 = 274
hope you get it!
Answer:

Step-by-step explanation:

<em>Add </em>
<em> to both sides</em>

B)12
Step-by-step explanation:
60=5x-10
+10 +10
70=5x
÷5 ÷5
x=12
Answer:
x = 16.
Step-by-step explanation:
x - 4 = 3/4 x
x - 3/4 x = 4
1/4 x= 4
x = 4*4
x = 16 (answer).