What value should come in the place of question mark (?) in the following questions?
$$1\frac{4}{5}+3\frac{3}{5}=?-4\frac{3}{10}$$
$$17 \times 19 \times 4 \div ? = 161.5$$
$$(9.8 \times 2.3 + 4.46) \div 3 = (3)^{?}$$
For the following questions answer them individually
What will be the compound interest on a sum of Rs. 7500/- at 4 p.c:p.a: in 2 years?
In how many different ways can the letters of the word ‘CREAM’ be arranged?
The circumference of a circle is 792 meters. What will be its radius?
Cost of 36 pens and 42 pencils is Rs.460/-. What is the cost of 18 pens and 21 pencils?
The ratio of the ages of A and B seven years ago was 3 : 4 respectively. The ratio of their ages nine years from now will be 7 : 8 respectively. What is B’s age at present?