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Svetach [21]
2 years ago
8

What will be 50% of 42

Mathematics
2 answers:
zimovet [89]2 years ago
7 0
Twenty one is the answer
Airida [17]2 years ago
7 0

To find 50% of 42, first write 50% as a decimal by moving the decimal point 2 places to the left to get .50.

Next, the word "of" means multiply, so we have to multiply.

(.50) × (40) = 21

Therefore, 50% of 42 is 21.

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One bar of candy A and two bars of candy B have 774 calories. Two bars of candy A and one bar of candy B contains 786 calories.
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◆ Define the variables:

Let the calorie content of Candy A = a
and the calorie content of Candy B = b

◆ Form the equations:

One bar of candy A and two bars of candy B have 774 calories. Thus:

a + 2b = 774

Two bars of candy A and one bar of candy B contains 786 calories

2a + b = 786

◆ Solve the equations:

From first equation,
a + 2b = 774
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Put a in second equation
2×(774-2b) + b = 786
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=> -3b = 786 - 1548
=> -3b = -762
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◆ Find caloric content:

Caloric content of candy B = 254 calorie

Caloric content of candy A = a = 774 - 2b = 774 - 2×254 = 774 - 508 = 266 calorie
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