A rare whale fossil was uncovered under layers of sediment. When the excavator took measurements, she found the tail to be as long

By Luna

A rare whale fossil was uncovered under layers of sediment. When the excavator took measurements, she found the tail to be as long as its head plus a quarter of the length of the body. When the archaeologist came in, he measured the length of the body. He found it to be ¾ of the total length. They made arguments about how such a fish would swim in the water. To make proper predictions they measured the head size, and found it to be 4 inches long. What is the total length of this whale?
A)128 B)99 C)136 D)142
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2 thoughts on “A rare whale fossil was uncovered under layers of sediment. When the excavator took measurements, she found the tail to be as long”

  1. [tex]\Large\underbrace\pink{Answer}[/tex]

    128 inches

    [tex]\large\underbrace\green{solution\:steps}[/tex]

    [tex]\sf{➟Let\:the\:total\:size\:of\:the\:whale’s\:body\:be\:x}[/tex]

    [tex]\sf{Then,\:the\:size\:of\:the\:whale’s\:body\:is \frac{3}{4} x}[/tex]

    [tex]\sf{And,\:the \: size \: of \: the \: whale \: tail \: is \: 4 + ( \frac{1}{4} \times \frac{3}{4}) x}[/tex]

    [tex]\bf\red{According\:to\:the\:question:}[/tex]

    [tex]\sf{x – ( \frac{3}{4} + (4 + \frac{3}{16} x)) = 4}[/tex]

    [tex]\sf{⇒x – ( \frac{3}{4} x + 4 + \frac{3}{16} x) = 4}[/tex]

    [tex]\sf{⇒x – \frac{3}{4} x – 4 – \frac{3}{16} x = 4}[/tex]

    [tex]\sf{⇒x – \frac{3}{4} x – \frac{3}{16} x = 4 + 4}[/tex]

    [tex]\sf{⇒ \frac{16x – 12x – 3x}{16} = 8}[/tex]

    [tex]\sf{⇒ \frac{x}{16} = 8}[/tex]

    [tex]\sf{⇒x = 8 \times 16}[/tex]

    [tex]\sf{⇒x = 128}[/tex]

    [tex]\bf\purple{Answer:}[/tex]

    The total size of the whale is 128 inches.

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  2. Step-by-step explanation:

    [tex]\huge\bf\underline{Given:}[/tex]

    => The tail is to be as long as it’s head plus a quarter of the length of the body.

    => Length of body be ¾ of the length.

    => Head is 4 inches long.

    [tex]\huge\bf\underline{To \: Find:}[/tex]

    => The total length of whale.

    [tex]\huge\bf\underline{Solution:}[/tex]

    => Head = 4 inch

    => Body = x inch

    => Tail = Head + 1/4x

    => Tail = 4 + x/4 inches.

    Total length = Head + Body + Tail

    => 4+x+4+x/4

    => 8 + 5x/4

    Body = 3/4T Total length

    x = 3/4 (8 + 5x/4)

    4x = 3 × 32 + 5x/4

    16x = 96 + 15x

    x = 96

    Total length = 8 + 5 × 96/4

    => 8 + 5 × 24

    => 8 + 120

    => 128

    [tex]\huge\sf\overbrace{Answer}[/tex]

    => Head = 4 inches

    => Body = 96 inches

    => Tail = 28 inches

    Therefore, The total length of the whale is 128inches.

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