If a + b = 10 and 3a + 2b = 40, then (3a + b) will be _____?
- 50
- 48
- 36
- None of these
Explanation
Given equations:
a + b = 10 ... (1)
3a + 2b = 40 ... (2)
We need to find 3a + b.
Multiply equation (1) by 2:
2a + 2b = 20 ... (3)
Subtract equation (3) from equation (2):
(3a + 2b) - (2a + 2b) = 40 - 20
a = 20
Now, find b:
a + b = 10
20 + b = 10
b = -10
Calculate 3a + b:
3a + b = 3(20) + (-10)
= 60 - 10
= 50
Related MCQs
- 10 and 30
- 15 and 25
- 20 and 20
- 12 and 28
اس سوال کو وضاحت کے ساتھ پڑھیں
- (t² + 4)(t - 2)(t - 2)
- (t² - 4)(t² - 4)
- (t² + 4)(t + 2)(t - 2)
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- +4
- -4
- +16
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
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