\fdO'^ - Old Forge Coal Mines

(146) -r : 5 :: 27 : 12.5. (147)
ARITHMETIC. 91
45 : GO :: x : 24
5 GO.i' = 45X24
12.5 ) 1 3 5.0 ( loj Ans.
^^'^= ^'^^^
'
125
100 4
125 5
^ = L080 = i8.Ans.
60
(148) ;r : 35 :: 4 : 7. 7.r=35x4
(149) 9 : x :: 6 : 24.
6.ar=9x24
7;r=140 6;r=216
140
X = = „^
20.
-y-
.
Ans.
216 ^^ X = -— = 36.
.
Ans.
(ISO)
-^^1,000 : fl,331 :: 27 : ;r. -f^T^OOO = 10.
10: 11:: 27 : jr. V^i;33T=ll.
10-t:=297. 1 1 1'331(11
297 ^^ „ 1 2 1
;r = —-- = 29.7. _ _
10
2 300 331
Ans.
1 31 331
(151) 64 : 81 = 21' : .r'.
30 331
1
31
Extracting the square root of each term of any proportion
does not change its value, so we find that -/el : -/Sl =
|/2p : 4/^'
is the same as
8 : 9 = 21 :.r
8 ^ = 189
;tr= 23.625. Ans.
(162) 7 + 8 : 7 = 30 : -r is equivalent to
15 : 7 = 30 : X.
15 ;ir = 7 X 30
15;ir=210
X = -—— = 14. Ans.
15