An arrowhead or point is the usually sharpened and hardened tip of an arrow, which contributes a majority of the projectile mass and is responsible for impacting and penetrating a target, as well as to fulfill some special purposes such as signaling.
A + c = 148 -> c = 148 - a
12a + 9c = 1410
12a + 9(148 - a) = 1410
12a + 1332 - 9a = 1410
3a = 78
a = 26
26 + c = 148
c = 122
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14 kids in your school are 5 years old, 23 are 6, 21 are 7, 32 are 8, and 42 are 9. whats the average age in the school