28 out of 40 of the students passed the test
Actually you can't solve this. There is no solutions.
1. To solve this problem, you must make a System of equations.
2. The equations are:
d+g=22 (i)
0.75d+1.25g=21 (ii)
3. If you clear "d" from the equation (i), you have:
d+g=22
d=22-g
4. Now, you must substitute d=22-g into the equation (ii):
0.75d+1.25g=21
0.75(22-g)+1.25g=21
5. When you clear "g", you obtain its value:
16.5-0.75+1.25g=21
16.5+0.5g=21
0.5g=21-16.5
g=4.5/0.5
g=9 <span>Golden Delicious apples
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6. If you also want to know the value of "d", you can substitute g=9 into the equation (i) and clear "d":
d+g=22
d+9=22
d=22-9
d=13 <span>Delicious apples
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How many Golden Delicious apples did Mary buy?
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The answer is: Mary bought 9 Golden Delicious apples.
Answer:
P = 180 cm.
Step-by-step explanation:
Perimeter = 2 Lengths + 2 Widths
P = 2l + 2w
P = (2 * 40) + (2 * 50)
P = 80 + 100
P = 180 cm.
