Example 3 If a student saves Ghe 1 on the first day, Ghe 2 on the second day, Ghe 3 on the thit day and so on. What will be his total saving in 365 days?

15. 91,112 तथा 49 का म.स. है \( \begin{array}{llll}\text { (a) } 7 & \text { (b) } 13 & \text { (c) } 21 & \text { (d) } 14\end{array} \)

13. 60 और 72 के महत्तम समापवर्तक और लघुत्तम समाप गुणनफल बराबर होगा (a) दोनों संख्याओं के योग के (b) दोनों संख्याओं के अन्तर के

Ratios \( 3: 6= \)

(a) A fruit drink is made using 1.5 litres of apple juice and 450 millilitres of mango juice. Write the ratio apple juice : mango juice in its simplest form.

With the use of a calculator, evaluate each of the follov 3 significant figures. (a) \( \left(8.59 \times 10^{-7}\right) \times\left(0.392 \times 10^{5}\right) \) (b) \( \left(8.05 \times 10^{6}\right) \div\left(7 \times 10^{-2}\right) \) (c) \( 3.2 \times 10^{6}+1.8 \times 10^{4} \) (d) \( 1.97 \times 10^{7}-2.02 \times 10^{5} \)