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a_sh-v [17]
3 years ago
15

Elena and her grandfather both just had birthdays last week. The sum of their ages is 100 years. Her grandfather’s age is 4 time

s Elena’s age. How old are Elena and her grandfather?
Mathematics
1 answer:
ZanzabumX [31]3 years ago
4 0

Answer:

Grandfather age = 20 * 4 = 80

Step-by-step explanation:

Let Elena age be x

grandfather age is 4x

x + 4x = 100

5x = 100

x = 100/5 = 20 = Elena age

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8 0
3 years ago
Jada solved the equation Negative StartFraction 4 over 9 EndFraction = StartFraction x over 108 EndFraction for x using the step
GalinKa [24]

Answer:

Jada should have multiplied both sides of the equation by 108.

Step-by-step explanation:

The question is incomplete. Find the complete question in the comment section.

Given the equation -4/9 = x/108, in order to determine Jada's error, we need to solve in our own way as shown:

Step 1: Multiply both sides of the equation by -9/4 as shown:

-4/9 × -9/4 = x/108 × -9/4

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Cross multiplying

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It can also be solved like this:

Given -4/9 = x/108

Multiply both sides by 108 to have:

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Jada should have simply follow the second calculation by multiplying both sides of the equation by 108 as shown.

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