Question

What is the value of D for the simultanenous
equations 3x - 2y =6 and 2x + y = 11?
(A) 1 (B) -1 (C) 7 (D) -7​

Answer 1

Answer:

ANSWER

Let us first factorize the given numbers as shown below:

20=1×2×2×5=2

2

×5

1

30=1×2×3×5=2

1

×3

1

×5

1

40=1×2×2×2×5=2

3

×5

1

50=1×2×5×5=2

1

×5

2

LCM of 20,30,40 and 50=2

3

×3

1

×5

2

=600

Therefore, the required number is 600+10=610.

Hence, the least three-digit number which when divided by 20,30,40 and 50 leaves remainder 10 in each case is 610.