Question

please solve 7,8,10,12 pleasw

Answer 1

7)Let Meera's present age is X
Her brother 's age = X-10


after 3 years

Meera 's age= X+3
Her Brother 's age= X-10+3=X-7

3(X+3) = 4(X-7)
3X+9 =4X-28
X= 37

So Meera's present age is 37 years .

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8) Let integers are X, X+1, X+2

ATQ

2×X + 4×(X+1) +6×(X+2)= 160

Or, 2X+ 4X+4 + 6X+12 =160

Or, 12X=160-16

Or, X= 12

So integers are 12,13 & 14
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9) Perimeter of Isosceles Triangle = base + 2× equal side


ATQ

P = 16.7 cm
7.9 +2× equal side = 16.7
2×S = 16.7- 7.9= 8.8

Equal Side = 4.4 cm

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10)
X+Y =85
X-Y = 25

2X=110
X=55

Y= 30
So numbers are 55 and 30.

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11)
Let rational number is X

ATQ
5/12 - X×3/2 = -6/7

3X/2 = 5/12 +6/7

3X/2 = (35+ 72)/84

X= 107/84 ×2/3
X= 214/ 252

X= 107/126
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12)
Let Gopi 's present age is X

ATQ

X+16 = 5×X

X+16 =5X

X= 4

So Gopi 's present age is 4 years.

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